UNIVERSITY OF CALIFORNIA, SAN DIEGO UNIVERSITY OF CALIFORNIA, SAN DIEGO 3 1822 04429 0633 3 1822 04429 0633 ATMOSPHERIC OPTICS GROUP TECHNICAL NOTE NO. 241 Version 2.1 JAN 1996 Offsite (Annex-Jo ronals) QC 974.5 .143 no. 241 MAINTENANCE AND TROUBLE SHOOTING MANUAL DAY/NIGHT WHOLE SKY IMAGER (E/O CAMERA SYSTEM 6) UNIVERSITY OF CALIFORNIA SAN DIEGO J. E. Shields R. W. Johnson M. E. Karr D. R. Sauer J. R. Varah R.A. Weymouth FORN LIGH : 1868 The material contained in this note is to be considered proprietary in nature and is not authorized for distribution without the prior consent of the Marine Physical Laboratory. SCRIPPS INSTITUTION OF OCEANOGRAPHY MARINE PHYSICAL LAB San Diego, CA 92152-6400 UNIVERSITY OF CALIFORNIA, SAN DIEGO 1 ET LI 3 1822 04429 0633 TECHNICAL NOTE NO. 241 MAINTENANCE AND TROUBLE SHOOTING MANUAL J.E. Shields, R.W. Johnson, M.E. Karr, D.R. Sauer, J.R. Varah, R.A. Weymouth SUMMARY This manual provides information on the 6-month preventative maintenance procedures for the Day/Night Whole Sky Imager. Instructions for trouble shooting and field repairs are also included. An overview of operation of the system and daily procedures is provided in Technical Note 240, which is the Operations Manual.. Table of Contents Summary List of Appendices List of Tables List of Figures 1. Introduction 2. Maintenance Check List 3. Short-form Maintenance Check List 1. Standard Long Term Maintenance 4.1 Filling the Cooling System Reservoir 4.2 Draining and Refilling the Cooling System 4.3 Replacing the Tygon Tubing in the Coolant System 4.4 Refilling the Camera Housing with Nitrogen 4.5 Replacing the Dome on the Camera Housing 4.6 Adjusting the Occultor Chain Tension & Trolley Tension 4.7 Occultor Trolley Alignment 4.7.1 Symptoms 4.7.2 Probable Cause 4.7.3 Alignment Procedures 4.8 Power up Sequence from Setup Instructions 4.9 Replacing the Desiccant 4.10 Inspect all Seals, Grommets, and Screws 5. Replacing Line Replaceable Units 5.1 Replacing the Camera Housing and CEU 5.1.1 Removing the Camera Housing 5.1.2 Installing the New Camera Housing 5.1.3 Replacing the CEU 5.1.4 Powering Up and Completing the Camera Replacement 5.2 Replacing the Acrylic Dome 5.3 Replacing the Teca Cooler 5.4 Replacing the TE Controller 5.5 Replacing the Flow Meter and Flow Switch 5.6 Replacing the Pump 5.7 Replacing the Radiator 5.8 Replacing the Humidity Sensor 5.9 Replacing the Occultor and/or Arc Subassembly 5.9.1 Disconnect the Old Occultor 5.9.2 Remove the Old Occultor Assembly 5.9.3 Mount the New Occultor Assembly 5.9.4 Install the Arc Drive on the New Occultor Assembly 5.9.5 Connect the New Occultor Electrically 5.9.6 Power up the New Occultor 5.9.7 Install the Arc Drive Dummy Plate on the Old Occultor 5.9.8 Prepare the Old Occultor for Return Shipment 5.10 Replacing the Occultor Arc Drive Subassembly 5.11 Replacing the Occultor Trolley Chain 5.12 Replacing the Occultor Trolley 5.13 Replacing the Occultor Trolley Drive 5.14 Replacing the Signal Cable Set and Power Cables 5.14.1 Disconnect the Old Cable Bundle at the Blue Box 5.14.2 Disconnect the Old Cable Bundle at the White Box 5.14.3 Connect the New Cable Bundle at the Blue Box 5.14.4 Connect the New Cable Bundle at the White Box 5.15 Replacing the Sensor ACP 5.16 Replacing the Occultor ACP 5.17 Replacing the Computer Hardware Inside the Computer 5.17.1 General Internal Computer Parts Instructions 5.17.2 Specific Internal Computer Parts Instructions 5.18 Replacing External Computer-related Components 5.18.1 General External Computer Parts Instructions 5.18.2 Specific External Computer Parts Instructions 5.19 Replacing the Clock radio and Antenna 6. Trouble Shooting and Repair 6.1 Camera Imagery is Missing or Abnormal · 6.1.1 Camera is Off 6.1.2 Camera is On, but there is no image 6.1.3 Camera image is present but Abnormal 6.2 Time or Date are not correct 6.2.1 Time source is from sponsor 6.2.2 Time source is WWV 6.2.3 The Date Appears Abnormal 6.3 Camera Housing appears wet inside 6.3.1 Detecting a leak 6.3.2 Drying the camera housing 6.4 Occultor is not obscuring sun 6.4.1 Occultor has stopped 6.4.2 Occultor is moving but misaligned 6.5 The Cooling System is Abnormal 6.5.1 The Environmental Housing Temperature is Abnormal 6.5.2 The Camera Housing Temperature is Abnormal 6.5.3 The Camera CCD Chip Temperature is Abnormal 6.6 The Computer is Abnormal 6.6.1 The Computer Fails to Reboot 6.6.2 The Computer Stalls During Operation 6.6.3 The Computer Sounds Abnormal 6.6.4 The Computer Lights are Abnormal 6.6.5 The Tape Drives are Abnormal 6.7 Occultor ACP Abnormalities 6.8 Sensor ACP Abnormalities 6.9 Abnormal Image Brightness 7. Red, Yellow Flags in Day/Night WSI Acquisition Code 8. Handling the Operating Systems iii List of Appendices Appendix A, AV95-016t Appendix B, AV95-028t Appendix C, AV95-029t Appendix D, Desiccator Directions List of Tables Table No. Table Title 4.1 Estimated Maintenance Schedule 7.1 Diagnostic Flag Levels 7.2 7.3 Summary of Red Flag Idents Summary of Yellow Flag Idents Red flag string Yellow flag string 7.4 7.5 iv List of Figures Figure No. Figure Title Page 4-1 4-2 WSI Coolant Connections Components in Trolley "Sandwich" Front View, from North Arc near trolley drive 4-3 4-4a Side View, with trolley chain engaged 4-46 Side view with larger idlers 4-5 Side view with trolley chain disengaged 5-1 WSI Camera Housing Connections, Bottom View 5-2 WSI Environmental Housing Connections, Rear View 5-3 CEU View from side 5-4a 5-46 Environmental Housing, Schematic p.1 Environmental Housing, Schematic p.2 WSI Occultor External Connections 5-5 5-6 WSI Controller Connections 6-1 Trouble Shooting Flowchart, Image is not Present or Abnormal 6-2 Trouble Shooting Flowchart, Occultor is not shading dome On Initial Installation 6-3 6-4 6-5 Trouble Shooting Flowchart, Occultor is not shading Dome following previous clean operation The Front Panel LEDs 8mm Tape Drive, Quick Reference Exabyte Light states Sample Day/Night WSI status file Sample Day/Night WSI Header Table 6-6 7-1 7-2 Technical Note 241 Page 1 MAINTENANCE AND TROUBLE SHOOTING MANUAL DAY/NIGHT WHOLE SKY IMAGER (E/O Camera System 6) Version 2.1 January 1996 1. INTRODUCTION This manual provides information on the 6-month preventative maintenance procedures for the Day/Night Whole Sky Imager. Instructions for trouble shooting and field repairs are also included. An overview of operation of the system and daily procedures is provided in Technical Note 240, which is the Operations Manual. 2. MAINTENANCE CHECK LIST The maintenance check list in this section provides a series of steps for evaluating the health and status of the WSI. It is intended for use by a repair team for routine 6-month checks. It starts with a hands-off inspection of the system as it runs. After this, additional tests are run with the program stopped. After all checks are made, and any repairs accomplished, the system is returned to operation and a final set of checks verifies that the system has been returned to fully normal conditions. Technical Note 241 Page 2 DAY/NIGHT WHOLE SKY IMAGER PREVENTATIVE MAINTENANCE FULL SYSTEM CHECKLIST This checklist is designed to provide a full evaluation of the WSI hardware. It is intended as a preventative maintenance evaluation, and is directed toward a field team inspecting a WSI which is running on arrival. If the system is not fully operational, some of these steps may not be applicable. For steps 1 and 2, nothing should be touched, stopped, or adjusted on the WSI. These inspection items are designed to evaluate the system in its automated mode. 1. Visual Inspection on Arrival: Controller 1.1. Monitor 1.1.1. Image Appears Normal Expected Result: Images are being acquired, sky or clouds are visible. Occultor may be seen in image. Full circle is visible except at bottom of image. Negative results: Troubleshooting Secn 6.1 1.1.2. Camera Output Appears Normal Expected Result: Black area outside circular image is mostly black, with little if any gray speckle during the day (speckle is OK under long exposures at night). Circular image area is significantly brighter than the black area during the day, and shows little graininess or speckle. Negative results: Troubleshooting Secn 6.1 and 6.1.3 1.1.3. Image Shows Normal Occultor Position Expected Result: On a clear day, solar disk is visible in occultor, or occultor appears to be blocking solar disk and approximately centered on solar disk Negative results: Troubleshooting Secn 6.4 1.1.4. Printed Date and Time Beside Image are Valid Expected Result: Time shows the most recent grab time, and should be 10 minutes or less prior to the current time as indicated on the Zenith clock. A "W" or "B" after the time indicates that it is correctly receiving Z-time from the WWV (W) clock or is using Z-time from Bios (B). The date should be the Greenwich date, not local date. The relationship between local and Z date is site dependent, for T.N. 241, Section 2 Checklist Technical Note 241 Page 3 example at Manus (147°E) Z-time = local time - 10 hrs, Z date = local date from 00:00Z until 14:00 Z, and Z date = local - 1 after 14:00Z and until 24:00 Z. Likewise, Z date = local date from 10:00 local until 24:00 local, and Z date = local date - 1 from 00:00 local until 10:00 local. Negative results: Troubleshooting Secn 6.2 1.1.5. Printed Instrument Settings Beside Image are Valid Expected Result: During the daylight, the normal settings are Exposure = 100 ms ND = 3 SP= 3 In the above, Exposure is the shutter exposure time in msec, ND is the neutral density filter selection, and SP is the spectral filter selection. In early morning and late evening, the exposure is longer, and the ND setting changes to 2. At night, the exposure is longer, ND is 1, and SP may be either 2 or 3 depending on the amount of moonlight, if any. Negative results: Troubleshooting Secn 6.9 1.1.6. Yellow and Red Flag Check Expected Result: The instrument performs a variety of self-checks illustrated in Section 7 of the Troubleshooting Manual. In the case of the occurrence of a yellow flag or red flag, this will be indicated on the monitor screen. Normally, there should be no current red or yellow flags. Negative results: Troubleshooting Secn 7. 1.1.7. Image Cycle is Changing Normally Expected Result: During the day, an image is grabbed in SP 3 and SP 4, followed by a 10- minute wait. Watch the screen, and see that these images are being acquired. Negative results: Troubleshooting Secn 6.8 1.2. Computer 1.2.1. Lights are Normal Expected Result: Green power light on Battery light off (Batteries were disconnected) Orange Turbo light on (relates to system processor speed) Orange Disk light flashes when disk is being accessed Negative results: Troubleshooting Secn 6.6 (see Seen 6.6 for figure) T.N. 241, Section 2 Checklist Technical Note 241 Page 4 1.2.2. Computer Sounds Normal Expected Result: There are no loud sounds related to fan or disk problems Negative results: Troubleshooting Secn 6.6 1.3. Occultor Accessory Control Panel (ACP) 1.3.1. Arc Position Readout is Normal Expected Result: The arc position readout should be consistent with the actual arc position observed in the image, as illustrated below. 180° Negative results: Troubleshooting Secn 6.4 and 6.4.2 1.3.2. Trolley Position Readout is Normal Expected Result: The trolley position readout should be consistent with the actual arc position observed in the image, as illustrated below. 180°/ 135° 90° 45° 10° Negative results: Troubleshooting Secn 6.4 and 6.4.2 T.N. 241, Section 2 Checklist Technical Note 241 Page 5 1.4. Sensor Accessory Control Panel (ACP) 1.4.1. Spectral Light Appears Normal Expected Result: During the standby period, the SP = 4 position light should be on during the day, and either 2 or 4 at night. Negative results: Troubleshooting Secn 6.8 1.4.2. Spectral Light is Changing Normally Expected Result: During the grab on the 10-minute mark, the filter changer should change cleanly, cycling from its resting position to the next grab position. Normally the lights should be a solid "on" followed by solid "off" as the filter wheel cycles through the position. It should not be necessary to cycle through more than one full revolution to find the correct filter. A small amount of "flashing" is ok, i.e. the LED may go off briefly when it is first turned on due to the mechanical vibration of the wheel as it stops. Negative results: Troubleshooting Secn 6.8 1.4.3. Neutral Density Light Appears Normal Expected Result: During the standby period, the SP = 3 position light should be on during the day, and either 1, 2 or 3 during twilight hours and at night. Negative results: Troubleshooting Secn 6.8 1.4.4. Neutral Density Light is Changing Normally Expected Result: Normally the ND light will not change at all between 10-minute image sets. If it does change, it should change cleanly, as described in item 1.4.2 above. Negative results: Troubleshooting Secn 6.8 1.4.5. Camera Housing Temperature Readout Appears Normal Expected Result: Normal readings should be somewhat above 16 C, which is the environmental housing set point, but may vary up to 32 C before hitting a warning condition. Negative results: Troubleshooting Secn 6.5.2 T.N. 241, Section 2 Checklist Technical Note 241 Page 6 1.4.6. CCD Chip Temperature Readout Appears Normal Expected Result: Normal readings should be near -30 C, but may vary up to -25 C before hitting a warning condition. Negative results: Troubleshooting Secn 6.5.3 1.4.7. Environmental Housing Temperature Readout Appears Normal Expected Result: Normal readings should be near 16 C, but may vary up to 32 C before hitting a warning condition. Negative results: Troubleshooting Secn 6.5.1 1.4.8. Coolant Flow Readout Appears Normal Expected Result: Normal readings should be near .25 gpm, but may drop to .125 gpm before hitting a warning condition. Negative results: Troubleshooting Secn 6.5.4 1.4.9. Nitrogen Pressure Readout Appears Normal Expected Result: Normal readings should be near 5 psi, but may drop to 2 psi before hitting a warning condition. Negative results: Maintenance Secn 4.4 Exabyte Tape Rack 1.5.1. Lights on Tape Drive #1 (Raw Data) Appear Normal Expected Result: The left hand (or top light should be off except during warm up Intermittently, as the computer accesses the drive (on the 10-minute grabs), the middle light should flash green or orange The right hand (or bottom) light should be solid green If all lights are flashing, this means that the tape drive will need cleaning when the next tape is inserted. Negative results: Troubleshooting Secn 6.6.5 1.5.2. Lights on Tape Drive #2 (Processed data) Appear Normal Expected Result: Same as 1.5.1 T.N. 241, Section 2 Checklist Technical Note 241 Page 7 1.5.3. Lights on Tape Drive #3 (Standby) Appear Normal Expected Result: Same as 1.5.1. 2. Visual Inspection on Arrival: Sensor 2.1. Occultor 2.1.1. Arc and Trolley Position Appears Normal Expected Result: Arc should be toward the sun, i.e. East in morning and West in evening, with occulting disk on the trolley in a position such that it shades the dome from direct sunlight. Under moonlight, the occultor should shade the dome from moonlight. Negative results: Troubleshooting Secn 6.4 2.2. Dome 2.2.1. Dome Appears Normal Expected Result: Dome should be reasonably clear, with few scratches and little crazing. Crazing is fine hair-line cracks over the dome surface. Surface should appear clear, i.e. not milky. Negative results: Maintenance Secn 4.5 2.2.2. System Appears Dry Inside Dome Expected Result: There should be no obvious moisture inside the dome. Negative results: Troubleshooting Secn 6.3 This completes the initial visual inspection. The inspection in Steps 3 through 8 involve disturbing the system or the program, and will result in loss of data during the procedure. 3. Hands-on Inspection and Maintenance with Program Running: Controller 3.1. Program Diagnostics 3.1.1. Activate Diagnostic Output Instructions: To activate the readout of automated program diagnostics, press the "S" (for "Status") key. The "Enter" key should not be used. T.N. 241, Section 2 Checklist Technical Note 241 Page 8 3.1.2. Check Yellow and Red Flag Listing Instructions: If there are no current flags, then the program will skip to step 2 below. If there are any current flags triggered, this screen will display what flags are triggered, and what needs to be checked. For example, if the environmental housing temperature is above ideal range, this will be noted, with instructions to check the cooler. Note any flags which are indicated. See Section 7 for more details. 3.1.3. Check Status File Listing Instructions: This listing, displayed in Fig 7-1 of Section 7, shows a time history of the current day (and the previous day if desired). Make the following checks: 3.1.3.1. Check Column 2, Data Acquisition Time Instructions: Column 2, verify that the time of data acquisition is normal, i.e. data are acquired every 10 minutes. Verify that the time is consistent with a standard source such as WWV. Negative results: Troubleshooting Secn 6.2 3.1.3.2 Check Column 5, Spectral Filters Instructions: Column 5 shows the spectral filters used during the image acquisition. During the day, this spectral filter sequence should be "34" except at the beginning or when the exposure (shown in Col. 7) changes. When the exposure changes, the sequence is "341". At night, on moonless nights, the sequence is "2" except when the exposure changes, in which case it is "21". Under moonlight, it may be either the daylight or the starlight sequence, depending on the brightness of the moon. Negative results: Troubleshooting Secns 6.8, 6.9 and 7. 3.1.3.3 Check Column 6, Neutral Density Filters Instructions: Column 6 shows the neutral density filter used for each set of images. This should be 3 during the day, 2 in twilight, and 1 at night. Negative results: Troubleshooting Secns 6.8, 6.9 and 7. T.N. 241, Section 2 Checklist Technical Note 241 Page 9 3.1.3.4 Check Column 7, Shutter Exposure Time Instructions: Column 7 shows the exposure used on the shutter. This should range between 100 msec mid-day, to 60000 msec (1 min) under starlight. Negative results: Troubleshooting Secns 6.9 and 7. 3.1.3.5 Check Columns 8-12, Environmental Housing Sensors Instructions: Columns 8 - 12 show the output from the environmental housing sensors. These should generally fall within the ranges indicated in Table 7.1 of Section 7. Column 13 is not yet activated, and may be ignored. Negative results: Troubleshooting Secns 6.8 and 7. 3.1.3.6 Check Columns 14 and 15, Flags Instructions: Columns 14 and 15 provide more information on the yellow and red flags. If no flags have been activated, these columns are O's. If any flags have been activated, the most significant flag number is indicated. The priority of the flags is documented in Tables 7.2 and 7.3 of Section 7. Note that whereas steps 1.1.6 and 3.1.2 indicate the current flag status, this file provides a history throughout the day of the flag status. Negative results: Troubleshooting Secn 7. 3.1.4 Check Header Table If Any Flags Were Indicated in Step 3.1.3.6 Instructions: As soon as you are through viewing the status table, the system will query you regarding whether you wish to look at the headers. If any flags have been triggered, answer yes. You will see an output similar to Figure 7-2 of Section 7. This table shows the information embedded in the header in each image. In particular, note the last line, which shows the status of all the flags, in the format listed in Tables 7.2 and 7.3. If any flags were noted as triggered in step 3.1.3.6 above, look at this output to see if any additional flags have been triggered. If so, note and follow the instructions listed in Section 7. 3.1.5. Return Program to Normal Operation When you have evaluated the table in either section 3.1.3 or 3.1.4, it asks if you wish to see more. Answer "N" when you are done and wish to return to automated data acquisition. T.N. 241, Section 2 Checklist Technical Note 241 Page 10 4. Hands on Inspection and Maintenance with Program Running: Sensor 4.1. Environmental Housing (Internal) 4.1.1. Inspect Air Cooling System Expected Result: The thermo-electric air cooler should be blowing air at all times. Check for any obvious problems. Negative results: Troubleshooting Secn 6.5 and 6.5.1 4.1.2. Inspect Liquid Cooling System as Follows 4.1.2.1 Check for Coolant Contaminants Instructions: Verify that liquid coolant appears reasonably clear. That is, there should be no contaminants in excess of 1/8" diameter, and the coolant should be transparent or nearly transparent. If not, it will be necessary to turn off the program and camera on completion of tests, drain the system, and fill with new coolant as described in Secn 4.1.2.3. and Secn 4.2. 4.1.2.2 Check Reservoir Level Instructions: If the coolant is clear in step a, check reservoir, and fill if necessary as described in Step 4.1.2.3. 4.1.2.3 Fill Reservoir if Required Instructions: In order to fill the reservoir or the full cooling system, remove the white cap on the tube which penetrates the top of the housing. Fill with approximately two parts DEIONIZED DĪSTILLED water, and one part isopropyl alcohol. Fill to the top of the "full" line, and replace the cap on the fill tube.. 4.1.2.4 Verify That Wheel on Flow Switch is Spinning Freely. Negative results: Troubleshooting Secn 6.5.3 and 4.2 4.1.3. Check Desiccant Status and Replace if Required Instructions: Verify that the desiccant maintains a reasonably low relative humidity reading on the ACP (<50%), otherwise insert new desiccant canister. (Normal replacement intervals will be site-dependent.) T.N. 241, Section 2 Checklist Technical Note 241 Page 11 4.1.4. Check Nitrogen or Dry Air and Refill if Required If the nitrogen pressure readout at the ACP was less than 2.5 psi, repressurize camera housing to 5 psi. A transportable canister is provided on installation. To pressurize, reference Maintenance Secn 4.4 4.1.5. Check Cables Verify that cabling and wiring inside environmental housing appears to be in reasonable condition, i.e. no holes chewed by animals, and no cuts or cracks large enough to sever a wire. 4.1.6. Check Housing Condition Verify that housing appears generally clean and dry inside, clean as necessary. 4.2. External Sensor Checks 4.2.1. Check External Housing Condition Verify that environmental housing appears in reasonable condition 4.2.2. Check External Cables Verify that external cables appear to be in reasonable condition 4.2.3. Check Platform Stability Verify that platform appears strong and rigid 4.2.4. Check WSI Tie-down to Platform Verify that WSI is firmly attached to platform, replace cables if required, tighten turnbuckles if required. 5. System Tests and Maintenance with Program Stopped: Controller - 5.1. Exit Program by Hitting the "X" Key. Instructions: Hit X; do not use the "Enter" key. The program may take a while to respond, if it is in or near an image grab. T.N. 241, Section 2 Checklist Technical Note 241 Page 12 5.2. Check Filter Changer Operation as Follows: 5.2.1 Put Sensor ACP in Manual Instructions: On Sensor ACP, set local lockout key to "Off", and set both switches to "Manual" 5.2.2 Cycle Filter Wheels Instructions: Cycle both spectral and neutral density wheel both forward and backward as follows. To control a given wheel, switch "Select" switch toward the "SP" or "ND" lights. Then push the "Step" button to step the wheel by one filter position. The "UP/DOWN" switch controls the direction of the step. Verify smooth filter changer operation in both directions on both wheels. 5.2.3 Return Sensor ACP to Computer Control Instructions: Return ACP to "Computer", and return local lockout key to "ON" Negative results: Troubleshooting Secn TBD 5.3. Check Occultor Operation as Follows: 5.3.1 Put Occultor ACP in Manual Instructions: On Occultor ACP, set local lockout key to "Off", and set both switches to "Manual" 5.3.2 Cycle Arc Drive Instructions: Cycle Arc Drive from 0 to 180 (limits TBD) to verify operation over the full span as follows. Press "Motor" switch toward "drive". The two switches will drive in opposite directions. At the limit positions, the limit light should come on. 5.3.3 Check Arc 90° Point Instructions: Set Arc Drive to 90, verify that arc is directly overhead, i.e. in center of image. T.N. 241, Section 2 Checklist Technical Note 241 Page 13 5.3.4 Cycle Trolley Drive Instructions: Cycle Trolley Drive from 0 to 180 (limit TBD), as in Step 5.3.2, to verify operation over the full span. 5.3.5 Check Trolley 90° Point Instructions: Set Trolley Drive to 90, verify that trolley is directly overhead, i.e. in center of image. 5.3.6 Return Occultor ACP to Computer Control Instructions: Return ACP to "Computer", and return local lockout key to "ON" Negative results: Troubleshooting Secn 6.4 5.4 Filter Replacement 5.4.1. Power Off Blue Box and Replace Filter on Computer Instructions: Open back door of computer rack, and turn off power to the rack. (Do not turn computer power off alone.) Find the filter on the back of the computer. There is an electrical plug which prevents easy removal of the filter; remove this plug. Remove the filter, wash it, and replace it with a clean dry filter which should be stored with WSI parts. Replace the plug, and shut the door to the rack. 5.4.2 Replace Filter on Computer Rack Instructions: On the outside of the computer rack (blue box), at the top back of the right side, is a filter. Remove filter, wash, and replace with clean filter from WSI storage. 5.5 Computer System Check Instructions: Turn power to the blue box back on. This will allow the computer to go through its self test, verifying operation of the various cards and the hard disk. If the computer stalls, note the output on the screen and refer to the trouble-shooting manual. There will be a 30 second wait while the system gives the user an opportunity to interrupt, and then the WSI program should start automatically. After verifying that this process is complete, hit the "X" key to stop the program so that you may proceed with the remaining tests. Negative results: Troubleshooting Secn 6.6 T.N. 241, Section 2 Checklist Technical Note 241 Page 14 6. System Tests and Maintenance with Program Stopped: Sensor 6.1. Check External Occultor Chain Tension Instructions: Feel tension in exterior occultor chains. They should be under slight tension, as with a fan belt. Verify that the chain drive mechanism is free of debris and clean if necessary. (See Secn 4.6 for details.) Negative results: Maintenance Secn 4.6 or Replacement Secn. 5.11 6.2. Inspect Occultor Arc Drive Operation Instructions: While someone drives the arc drive from the ACP, listen and verify that the sound is even and smooth. Negative results: Replacement Secn 5.10 6.3. Inspect Occultor Trolley Drive Operation Instructions: While someone drives the trolley drive from the ACP, listen and verify that the sound is even and smooth. Negative results: Replacement Secn 5.12 6.4. Inspect Occultor Trolley Instructions: Verify that the trolley is free to move. If wheels are lifted slightly it should be possible to turn them. Negative results: Maintenance Secn 4.6 6.5. Clean Dome if Required Instructions: Wipe or brush dome lightly. If further cleaning is necessary, clean with lint- free non-abrasive cloth and distilled water (not alcohol) and try to avoid rubbing the dome too hard. See the Operations Manual Section 8.1 for details. 6.6. Clean Occultor Filter if Required Instructions: Clean optical filter with lint-free non-abrasive cloth and distilled water. 7. Return WSi to Normal Operation: Sensor 7.1. Verify Environmental Housing Normal Status Instructions: T.N. 241, Section 2 Checklist Technical Note 241 Page 15 Verify everything inside environmental housing has been returned to normal 7.2. Seal and Close Environmental Housing 7.3. Verify Occultor has Been Returned to Normal 7.4. Final General Inspection for Normal Conditions at Sensor 8. Return WSI to Normal Operation: Controller 8.1. Verify Both ACP's are on Remote with Local Lockout "ON" - 8.2. Start Automated Acquisition Instructions: Start program by entering "RUNWSI24" . Allow sufficient time for the program to reset itself (reset occultor etc.) prior to proceeding to Step 9. 9. Post-Maintenance Inspection: Controller This inspection repeats the initial inspection, and verifies that the WSI has returned to fully normal condition. It nearly duplicates the checks in Sections 1 and 2. 9.1. Monitor - 9.1.1. Image Appears Normal Images are being acquired, sky or clouds are visible. Full circle is visible except at bottom of image. 9.1.2. Camera Output Appears Normal Black area outside circular image is mostly black, with little if any gray speckle during the day (speckle is OK under long exposures at night). Circular image area is significantly brighter than the black area during the day, and shows little graininess or speckle. 9.1.3. Image Shows Normal Occultor Position On a clear day, solar disk is visible in occultor, or occultor appears to be blocking solar disk and approximately centered on solar disk 9.1.4. Printed Date and Time Beside Image are Valid Time shows the most recent grab time, and should be 10 minutes or less prior to the current time as indicated on the Zenith clock. The date should be the Greenwich date, not local date. (See Z-date and local date relationship under 1.1.4.) T.N. 241, Section 2 Checklist Technical Note 241 Page 16 9.1.5. Printed Instrument Settings Beside Image are Valid During the daylight, the normal settings are Exposure = 100 ms ND = 3 SP = 3 In the above, Exposure is the shutter exposure time in msec, ND is the neutral density filter selection, and SP is the spectral filter selection. In early morning and late evening, the exposure is longer, and the ND setting changes to 2. At night, the exposure is longer, ND is 1, and SP may be either 2 or 3 depending on the amount of moonlight, if any. 9.1.6. Yellow and Red Flag Check The instrument performs a variety of self-checks illustrated in Table 7.1. In the case of the occurrence of a yellow flag or red flag, this will be indicated on the monitor screen. 9.1.7. Image Cycle is Changing Normally During the day, an image is grabbed in SP 3 and SP 4, followed by a 10-minute wait. 9.2. Computer 9.2.1. Lights are Normal Green power light on Battery light off (Batteries were disconnected) Orange Turbo light on (relates to system processor speed) Orange Disk light flashes when disk is being accessed 9.2.2. Computer Sounds Normal There are no loud sounds related to fan or disk problems 9.3. Occultor Accessory Control Panel (ACP) 9.3.1. Arc Position Readout is Normal: The arc position readout should be consistent with the actual arc position observed in the image, as illustrated earlier. 9.3.2. Trolley Position Readout is Normal The trolley position readout should be consistent with the actual arc position observed in the image, as illustrated earlier. T.N. 241, Section 2 Checklist Technical Note 241 Page 17 9.4. Sensor Accessory Control Panel (ACP) 9.4.1. Spectral Light Appears Normal During the standby period, the SP = 4 position light should be on during the day, and either 2 or 4 at night. 9.4.2. Spectral Light is Changing Normally During the grab on the 10-minute mark, the filter changer should change cleanly, cycling from its resting position to the next grab position. A small amount of flashing is OK, but normally the lights should be a solid on followed by solid off as the filter wheel cycles through the position. It should not be necessary to cycle through more than 3 changes to find the correct filter. 9.4.3. Neutral Density Light Appears Normal During the standby period, the SP = 3 position light should be on during the day, and either 1, 2 or 3 during twilight hours and at night. 9.4.4. Neutral Density Light is Changing Normally Normally the ND light will not change at all between 10-minute image sets. If it does change, it should change cleanly, as described in item 9.4.2. above. — 9.4.5. Camera Housing Temperature Readout Appears Normal Normal readings should be near 16 C, but may vary up to 32 C before hitting a warning condition. 9.4.6. CCD Chip Temperature Readout Appears Normal Normal readings should be near -30 C, but may vary up to -25 C before hitting a warning condition. 9.4.7. Environmental Housing Temperature Readout Appears Normal Normal readings should be near 16 C, but may vary up to 32 C before hitting a warning condition. 9.4.8. Coolant Flow Readout Appears Normal Normal readings should be near .25 gpm, but may drop to .125 gpm before hitting a warning condition. 9.4.9. Nitrogen Pressure Readout Appears Normal T.N. 241, Section 2 Checklist Technical Note 241 Page 18 Normal readings should be near 5 psi, but may drop to 2 psi before hitting a warning condition. 9.5. Exabyte Tape Rack 9.5.1. Lights on Tape Drive #1 (Raw Data) Appear Normal The left hand (or top) light should be off except during warm up. Intermittently, as the computer accesses the drive (on the 10-minute grabs), the middle light should flash green or orange. The right hand (or bottom) light should be solid green. If all lights are flashing, this means that the tape drive will need cleaning when the next tape is inserted. - 9.5.2. Lights on Tape Drive #2 (Processed Data) Appear Normal (See 9.5.1 above) - 9.5.3. Lights on Tape Drive #3 (Standby) appear normal (See 9.5.1 above) - . . 10. Post-Maintenance Inspection: Sensor . . - -- 10.1. ------ - -- Occultor 10.1.1. Arc and Trolley Position Appears Normal ... --- -- --. . Arc should be toward the sun, i.e. East in morning and West in evening, with occulting disk on the trolley in a position such that it shades the dome from direct sunlight. Under moonlight, the occultor should shade the dome from moonlight. This concludes the preventative maintenance check. If no required repairs were detected, at this point the WSI should be back in fully operational, fully automated mode. T.N. 241, Section 2 Checklist Technical Note 241 Page 19 3. SHORT-FORM MAINTENANCE CHECK LIST The short-form maintenance check list in this section is intended for users familiar with the system. It contains the same checks in the check list provided in Section 2, however the explanations of the expected results have been deleted. A team with less experience with the WSI may also choose to use this form, and only refer to the form in Section 2. T.N. 241, Section 2 Checklist Technical Note 241 Page 20 DAY/NIGHT WHOLE SKY IMAGER PREVENTATIVE MAINTENANCE FULL SYSTEM CHECKLIST 1. Visual Inspection on Arrival: Controller 1.1. Monitor 1.1.1. Image Appears Normal 1.1.2. Camera Output Appears Normal 1.1.3. Image Shows Normal Occultor Position 1.1.4. Printed Date and Time Beside Image are Valid 1.1.5. Printed Instrument Settings Beside Image are Valid 1.1.6. Yellow and Red Flag Check 1.1.7. Image Cycle is Changing Normally 1 2 Computer 1.2.1. Lights are Normal - 1.2.2. Computer Sounds Normal 1.3. Occultor Accessory Control Panel (ACP) 1.3.1. Arc Position Readout is Normal - 1.4. 1.3.2. Trolley Position Readout is Normal Sensor Accessory Control Panel (ACP) 1.4.1. Spectral Light Appears Normal 1.4.2. Spectral Light is Changing Normally 1.4.3. Neutral Density Light Appears Normal 1.4.4. Neutral Density Light is Changing Normally 1.4.5. Camera Housing Temperature Readout Appears Normal 1.4.6. CCD Chip Temperature Readout Appears Normal 1.4.7. Environmental Housing Temperature Readout Appears Normal T.N. 241, Section 3 Checklist Technical Note 241 Page 21 1.4.8. Coolant Flow Readout Appears Normal 1.4.9. Nitrogen Pressure Readout Appears Normal 1.5. Exabyte Tape Rack 1.5.1. Lights on Tape Drive #1 (Raw Data) Appear Normal 1.5.2. Lights on Tape Drive #2 (Processed data) Appear Normal 1.5.3. Lights on Tape Drive #3 (Standby) Appear Normal 2. Visual Inspection on Arrival: Sensor 2.1. Occultor 2.1.1. Arc and Trolley Position Appears Normal 2.2. Dome 2.2.1. Dome Appears Normal 2.2.2. System Appears Dry Inside Dome 3. Hands-on Inspection and Maintenance with Program Running: Controller 3.1. Program Diagnostics 3.1.1. Activate Diagnostic Output (hit S for Status) 3.1.2. Check Yellow and Red Flag Listing (if applicable) 3.1.3. Check Status File Listing ___3.1.3.1. Check Column 2, Data Acquisition Time 3.1.3.2 Check Column 5, Spectral Filters _ 3.1.3.3 Check Column 6, Neutral Density Filters 3.1.3.4 Check Column 7, Shutter Exposure Time 3.1.3.5 Check Columns 8-12, Environmental Housing Sensors 3.1.3.6 Check Columns 14 and 15, Flags 3.1.4 Check Header Table If Any Flags Were Indicated in Step 3.1.3.6 3.1.5. Return Program to Normal Operation T.N. 241, Section 3 Checklist Technical Note 241 Page 22 4. Hands on Inspection and Maintenance with Program Running: Sensor 4.1. Environmental Housing (Internal) 4.1.1. Inspect Air Cooling System 4.1.2. Inspect Liquid Cooling System as Follows 4.1.2.1 Check for Coolant Contaminants 4.1.2.2 Check Reservoir Level 4.1.2.3 Fill Reservoir if Required 4.1.2.3 Verify That Wheel on Flow Switch is Spinning Freely. 4.1.3. Check Desiccant Status and Replace if Required 4.1.4. Check Nitrogen or Dry Air and Refill if Required 4.1.5. Check Cables 4.1.6. Check Housing Condition External Sensor Checks 4.2.1. Check External Housing Condition 4.2.2. Check External Cables 4.2.3. Check Platform Stability 4.2.4. Check WSI Tie-down to Platform 5. System Tests and Maintenance with Program Stopped: Controller 5.1. 5.2. Exit Program by Hitting the "X" Key. Check Filter Changer Operation as Follows: 5.2.1 Put Sensor ACP in Manual 5.2.2 Cycle Filter Wheels 5.2.3 Return Sensor ACP to Computer Control Check Occultor Operation as follows: 5.3.1 Put Occultor ACP in Manual 5.3.2 Cycle Arc Drive 5.3. T.N. 241, Section 3 Checklist Technical Note 241 Page 23 5.3.3 Check Arc 90° Point 5.3.4 Cycle Trolley Drive 5.3.5 Check Trolley 90° Point 5.3.6 Return Occultor ACP to Computer Control 5.4 Filter Replacement 5.4.1. Power down Blue Box and Replace Filter on Computer 5.4.2. Replace filter on Computer Rack 5.5. Computer System Power Check 6. System Tests and Maintenance with Program Stopped: Sensor - 6.1. 6.2. 6.3. 6.4 6.5. 6.6. Check External Occultor Chain Tension Inspect Occultor Arc Drive Operation Inspect Occultor Trolley Drive Operation Inspect Occultor Trolley Clean Dome if Required Clean Occultor Filter if Required 7. Return WSI to Normal Operation: Sensor 7.1. 7.2. 7.3. 7.4. Verify Environmental Housing Normal Status Seal and Close Environmental Housing Verify Occultor has Been Returned to Normal Final General Inspection for Normal Conditions at Sensor 8. Return WSI to Normal Operation: Controller 8.1. 8.2. Verify Both ACP's are on Remote with Local Lockout "ON" Start Automated Acquisition T.N. 241, Section 3 Checklist Technical Note 241 Page 24 9. Post-Maintenance Inspection: Controller 9.1. Monitor 9.1.1. Image Appears Normal 9.1.2. Camera Output Appears Normal 9.1.3. Image Shows Normal Occultor Position 9.1.4. Printed Date and Time Beside Image are Valid 9.1.5. Printed Instrument Settings Beside Image are Valid 9.1.6. Yellow and Red Flag Check 9.1.7. Image Cycle is Changing Normally 9.2. Computer 9.2.1. Lights are Normal 9.2.2. Computer Sounds Normal 9.3. Occultor Accessory Control Panel (ACP) 9.3.1. Arc Position Readout is Normal: 9.3.2. Trolley Position Readout is Normal 9.4. Sensor Accessory Control Panel (ACP) 9.4.1. Spectral Light Appears Normal 9.4.2. Spectral Light is Changing Normally 9.4.3. Neutral Density Light Appears Normal 9.4.4. Neutral Density Light is Changing Normally 9.4.5. Camera Housing Temperature Readout Appears Normal 9.4.6. CCD Chip Temperature Readout Appears Normal 9.4.7. Environmental Housing Temperature Readout Appears Normal 9.4.8. Coolant Flow Readout Appears Normal 9.4.9. Nitrogen Pressure Readout Appears Normal 9.5. Exabyte Tape Rack T.N. 241, Section 3 Checklist Technical Note 241 Page 25 9.5.1. Lights on Tape Drive #1 (Raw Data) Appear Normal 9.5.2. Lights on Tape Drive #2 (Processed Data) Appear Normal 9.5.3. Lights on Tape Drive #3 (Standby) appear normal noun 10. Post-Maintenance Inspection: Sensor 10.1. Occultor 10.1.1. Arc and Trolley Position Appears Normal T.N. 241, Section 3 Checklist Technical Note 241 Page 26 4. STANDARD LONG TERM MAINTENANCE This section discusses how to perform standard long term maintenance operations on the WSI, where long term is something which is done less often than monthly. Replacement times are based on experience in the continental U.S., but may vary for individual instruments or sites. A standard powerup procedure is also included in this section. For standard short term maintenance, please see the Operations Manual, Technical Note 240, which presents daily, weekly, and monthly check lists, and gives brief descriptions of procedures such as cleaning the dome. Also, it is good to refer to Tech Note 240 for the system description before repairing or replacing components. A full preventative maintenance as documented in Section 2 should be performed every 6 months. Table 4.1 lists an anticipated maintenance schedule. Replacement times will vary. For example, if the dome is routinely rubbed, rather than following cleaning instructions given in the operations manual, it may require more frequent replacement. Table 4.1 Estimated Maintenance Schedule Daily Weekly Monthly 6-mo 2 Yr Document Operation 0 8.1 0 8.1 0 8.3 0 8.1 08.1 08.1 17 0 8.2 0 8.4 0 8.5 T2 Visual inspection, white box Clean optical dome Inspect occultor Visual inspection, blue box Observe image Check for diagnostic flags Change tapes Internal white box inspection Clean computer air filter Preventative Maint. Inspection Fill coolant if needed Drain coolant Replace coolant tubing Refill nitrogen if needed Replace dome Adjust occ chain & trolley Align trolley Replace desiccant Inspect seals, grommets, and screws T 4.1 T 4.2 T 4.3 T 4.4 T 4.5 T 4.6 T 4.7 T 4.9 T 4.10 0= Operations Manual T = Trouble Shooting Manual, i.e. Op Man Secn 8.1 Technical Note 241 Page27 4.1 Filling the Cooling System Reservoir This procedure is for filling the cooling system, shown in Fig 4-1. It should be done whenever the coolant level on the reservoir is below the fill line. Required frequency is estimated to be once every 6 months, however monthly inspection is recommended in the short term maintenance. 1. Remove the black sunshade which covers the outside top of the environmental housing. 2. Unscrew the white fill tube which is near the North-west corner of the housing. 3. Add approximately two parts DEIONIZED DISTILLED water, and one part isopropyl alcohol. Fill to the top of the "full" line on the reservoir. This reservoir may be viewed through the West door. Note: DO NOT use tap water, as this will eventually destroy the cooling system inside the camera. 4. Replace the fill tube cap and the sunshade. 4.2 Draining and Refilling the Cooling System This procedure is for draining and filling the cooling system shown in Fig 4-1. It should be done whenever the coolant is cloudy enough to have visible lumps. Required frequency estimated to be once every 2 years. 1. Remove the black sunshade which covers the outside top of the environmental housing. 2. Turn off the WSI and disconnect all power to the system by unplugging the two orange power cords and unplugging the power to the blue rack. 3. Unscrew the white fill tube which is near the North-west corner of the housing. 4. Open the West door of the environmental housing, and find the white disconnects on the Tygon tubing which are nearest the camera housing. 5. Place a pan or paper towels on the cooler, to collect any water spilled in the next steps. 6. Have one person disconnect one of the quick disconnect pairs, immediately placing a finger over the male disconnect to minimize water spill. Have a second person disconnect the second pair, similarly blocking the male disconnect. The second person can then connect the two connectors closest to the camera, so that the camera is isolated from the rest of the coolant system. 7. Using the remaining unconnected male connector, bring the connector outside the housing, and drain the coolant. 8. Reconnect the tubing in its original configuration. Technical Note 241 Page 28 Fig 4-1 WSI Coolant Connections 11 Aug 95 Camera Reservoir 区区​- Duration Disconnects Cool air from Teca Pump Flow Swx Radiator Electrical to flow meter, camera on/off relay - delcontr.docs.JES auhor Technical Note 241 Page 29 9. Add approximately two parts DEIONIZED DISTILLED water, and one part isopropyl alcohol. Fill to the top of the "full" line on the reservoir. This reservoir may be viewed through the West door. Note: DO NOT use tap water, as this will eventually destroy the cooling system inside the camera. 10. Replace the fill tube cap and the sunshade, and return power to the components. 4.3 Replacing the Tygon Tubing in the Coolant System This procedure is for replacing the transparent tubing in the coolant system which is in the environmental housing and shown in Fig 4-1. After 2-5 years, the tygon tubing may become essentially opaque. In this case, the tubing may be replaced as follows 1. Using the existing system, measure the amount of tubing required, and order more tubing from the information given in the Line Replaceable Units Vendor List. Upon receipt of the tubing, proceed with step 2. 2. Drain the coolant by following steps 1 - 7 of Section 4.2. 3. Replace the tygon tubing by installing it in the same manner as the existing old tubing. 4. Refill the coolant by following steps 9 and 10 of Section 4.2. 4.4 Refilling the Camera Housing with Nitrogen This procedure is for refilling the camera housing with gaseous dry nitrogen. The purpose of the dry nitrogen is to keep the optics in the camera housing clean and dry. It is normally pressured to approximately 5 psi; the pressure may decrease over a period of weeks to years. The camera housing should be refilled before the pressure reaches 0. The pressure normally varies slightly, as the temperature varies. The pressure can be checked on the Sensor ACP, and the diagnostic flags will also alert the user when this needs to be filled. If the canister does not hold pressure when filled, refer to Secn 6.3.1. ALERT: Do not apply the gas to the camera housing until steps 1 - 4 have been followed successfully to ensure that no more than 5 psi is applied to the camera housing. 1. Open the West door of the environmental housing, and locate the gas valve stem on the bottom of the camera housing. Remove the cap. Use the standard techniques associated with the gas cylinder you are using to fill the camera housing to 5 lbs pressure. If you are using a spare gas cylinder supplied by MPL, these techniques are as given in Steps 3 through 5. 3. Open the valve closest to the gas cylinder, to make the gas available to the pressure gauges. Check that the first gauge is non-zero, indicating that there is gas in the cylinder. 4. Adjust the second valve (blue) so that the second gauge shows 5 psi. You can adjust this valve to increase pressure, but if you adjust the valve to decrease the Technical Note 241 Page 30 pressure you will have to briefly depress the gas chuck stem in the gas chuck at the end of the short hose to release the gas before you will get an accurate reading. 5. Place the gas chuck at the end of the fill hose onto the gas valve on the camera housing (just like a bicycle tire) and fill to 5 lbs pressure. 6. Remove the gas chuck, and replace the cap on the camera housing's gas valve stem. 7. Close the main valve on the gas cylinder (the one closest to the cylinder), and release the gas from the gauges and hose by depressing the gas chuck stem at the end of the hose. 4.5 Replacing the Dome on the Camera Housing This procedure is for replacing the dome on the camera housing, through which the camera views the sky. If the system is left either running or turned off with the camera housing cover on, the estimated time of replacement is 2-5 years, depending on how carefully it is cleaned. If the system is left turned off without the cover on, estimated replacement time may be one year or shorter. Replacement is indicated when the dome appears crazed, or heavily scratched, or scratches and crazing are visible in the imagery. The following procedure assumes that a new dome has been procured directly from the source indicated in the Line Replaceable Units Vendor List. 1. Remove the black sunshade on the top of the environmental housing. 2. Remove the two annular-shaped (ring) pieces of black insulation from the top of the camera housing. 3. The dome is held in place between a 10" ring, which forms the lid of the camera housing, and a 9" ring, which holds on the dome. Remove the camera housing lid formed by the 10" ring. 4. Put the lens cover on the fisheye lens (this is stored with WSI supplies), and cover the camera housing to protect it. 5. Removing the camera housing lid to a bench (so that pieces are not dropped into the camera housing), and remove the 9" ring from the top. 6. The dome is sealed in place on the 10" ring with self leveling RTV. Remove the dome, and clean the RTV off the 10" ring. (It will probably peel off cleanly; if not, a plastic scraper or any reasonably soft tool such as a credit card may be used.) 7. Place a thick bead of self leveling RTV in the slot in the 10" ring which holds the dome, and place the new dome on the RTV. Press down gently, and check for air gaps. It is often possible to eliminate the air gaps by rotating the dome smoothly. If this does not work, remove the dome, add RTV, and rotate the dome as necessary to seal gaps. 8. Replace the 9" ring and screw it into place. 9. Allow the camera housing lid with the new dome to dry on a level surface, until it is fully set up Technical Note 241 Page31 10. Check the O-ring which seals the camera housing lid, to verify that it still fits well in the o-ring groove; if not, replace it with a spare o-ring in the spares kit. 11. Gently wipe off excess O-ring lubricant from the o-ring, and relubricate lightly by placing a small amount on the fingers and gently pulling the o-ring between the fingers until all parts are smoothly lubricated. DO NOT glop lots of o-ring grease on the camera housing, as it tends to migrate onto the optical components. 12. Remove the fisheye lens cover, and clean the lens if necessary. 13. Replace the camera housing lid, but ONLY engage the screws by about 2 turns, so the lid is still loose. 14. Before proceeding with Step 15, read through steps 15 - 17. 15. Now start filling the camera housing with dry nitrogen as described in Section 4.4, steps 1 - 4, allowing the gas to escape out the partly engaged lid. Loosen or tighten the lid as necessary so that you can hear the air escaping out the lid. Continue for about 5 minutes, to allow most of the air to be replaced by nitrogen. Continue letting the nitrogen run during the next step. 16. Before sealing the lid, note that when sealing an o-ring interface it is always important to bring a given screw down only a couple turns at a time, alternating sides on the lid, so that the o-ring is not over-compressed on any one side. in mind, and alternating sides, slowly compress the O-ring by screwing in all the screws. 17. Once the lid is screwed on, the pressure in the camera housing will start to rise to the 5 psi limit set on the nitrogen regulator. Fill until the 5 psi is reached. 18. Remove the gas chuck, and replace the cap on the camera housing's gas valve stem. 19. Close the main valve on the gas cylinder (the one closest to the cylinder), and release the gas from the gauges and hose by depressing the gas chuck stem at the end of the hose. 20. Replace the insulation rings over the camera housing, and replace the sunshade on the environmental housing top. 4.6 Adjusting the Occultor Chain Tension and Trolley Tension This procedure allows one to tighten the occultor chain tension by shortening both chains by equal amounts. We do not yet have long term experience with the occultor chains, but we would estimate that the chain may need to be adjusted 6 months after fielding, with no further adjustments required. The procedure is indicated if the chain feels loose, or is slipping on the drive gear. The trolley tension may need adjustment every 6 months. 1. To check the trolley tension, lift each wheel slightly and check whether the wheels are each free to turn. Technical Note 241 Page32 2. If the wheels cannot be turned readily, spray water on the trolley to clean off the dust. If this is not sufficient, the wheels may be removed and cleaned, but one should use lock-tite when replacing the shoulder screws that hold the wheels. 3. Inspect o-rings on the wheels, and replace if required. 4. Move the trolley up and down a bit, to check the spacing between the 4 top wheels and the 2 bottom wheels. The spacing should be sufficient to allow free travel, but not so large as to allow the trolley to come off its track. The spacing can be adjusted by loosening the 3 screws holding the side plate on each side, sliding the side plate up or down as necessary, and retightening the screws. 5. Visually verify that all screws are in tightly. The four top screws should have their shoulders up tightly against the square metal trolley. (The shoulder to screw head spacing is long enough to allow .1" play in the delrin wheel location, but the shoulder should be in tight against the metal trolley.) 6. Check the chain tension. If you push gently on the chain half way between any two idler gears, you should expect about 1/4" deflection. If the deflection is over 1/2" and the chain is slipping on the drive gear, then the chain may have either stretched with use or expanded with heat, and should be shortened. 7. Put the Occultor ACP (Accessory Control Panel) in local, so that it is not under computer control. 8. Bring the arc drive near 180 degrees, and the trolley drive near 90 degrees, using the ACP. Compare the trolley with Figure 4-2. In Fig 4-2, starting at the right or West, we have the trolley light shield (the large round disk), which is screwed to 6 standoffs. At the other end of the standoffs are the filter retainer, filter (2" glass), top clamp plate, and lower clamp plate. These pieces are held to the standoffs with 6 screws, and the clamp plates hold the chains. 10. Read all of steps 6 - 8 before proceeding with step 6. 11. Loosen the 6 counter-sunk screws on the lower or East end of the trolley, i.e. those which go through the lower clamp plate, upper clamp plate, and filter retainer, into ffs. While one person holds these upper parts so they will not fall, finish removing the 6 screws. 12. Everything to the right or West of the lower clamp plate should now be free to be lifted off. Lift these parts off carefully, and place them aside, exposing the lower clamp plate and the chain ends. 13. The chains should still be held in place by the four small pins on the lower clamp plate. Have the second person help support this plate, to ensure that the chains do not come off during the following steps. 14. Lift one end of one chain off its pin, and bring it toward the center, so that the pin extends through a different link. Find which link is the proper link by testing the tension as indicated in step 1. Technical Note 241 Page33 15. Count the number of links which should probably be removed. Remove FEWER than this number; say only 2 if you think 4 is the right number. These may be removed with a wire cutter. Place the chain back on the small pin. 16. Remove the exact same number of links on the second chain, and place the second chain back on the small pin with the same link engaged as on the first chain. 17. Reassemble the trolley, by putting back the top clamp plate, filter, and filter retainer, and screwing the 6 screws back into the standoff from below (or East). 18. Run the trolley back and forth near 90 degrees with the ACP, and check the tension as in step 1, to see if you think it is still too loose. If it is still too loose, repeat steps 6 - 13 to get closer to the proper tension. as in step 1, to see if you 19. When the trolley has the proper tension, set it to 90 on the ACP, and check to see if the trolley is centered on the top set of idler gears. If it is not, proceed with the trolley alignment instructions given in Section 4.7. LO 20. Check the trolley motion over its full span, watching to be sure that it is moving smoothly. 21. Return the ACP to remote operation for computer control. 4.7 Occultor Trolley Alignment This procedure is for alignment of the occultor trolley. It assumes that the ACP calibration has not changed. 4.7.1 Symptoms: Occultor trolley position is misaligned with respect to the reading on the ACP by a fixed amount. As an example, if the ACP reads 100 when the trolley is at 90, 70 when the trolley is at 60, and 130 when the trolley is at 120, this indicates a trolley misalignment. When the trolley is ar 90, 70 when the 4.7.2 Probable Cause: The trolley chain has slipped with respect to the drive gear. This may happen in an ice storm or if the chain is too loose. A larger idler gear is in test on some units, which appears to alleviate this problem Technical Note 241 Page34 Trolley light shield Filter retainer Filter Top clamp plate- Lower clamp plate Fig 4-2 Components in Trolley " Sandwich 4.7.3 Alignment Procedure: 1. Put the Occultor ACP in local, and bring the trolley to a physical position of 60°, i.e. centered on the cross member of the arc which is 60° up from the north end of the arc, and the arc at 135º. 2. Note in Figs. 4-3 and 4-4 how the trolley chain which is on top of the arc (Fig 4- 4a), right hand side) goes down to the O position, where it contacts an idler gear, goes down around a drive gear, goes over a second idler gear, and back up the arc on its underside. In the version with larger idler gears at the O position, the chain goes between the gears, as shown in Fig 4-4b. 3. Have one person hold the trolley chain in position on the upper idler gear (Fig 4-5 right hand side). Technical Note 241 Page35 4. Now note the cross members which hold idler gears at 30, 60, 90 etc. on the arc. These cross members go from one arc plate to the other horizontally, and are made of delrin and hold an idler gear at each end for the two trolley chains. 5. Have a second person remove the lower or both cross members at the 30° position (Fig 4-5). This will provide slack in the lower part of the chain. The first person holding the trolley chain in position on the upper idler at 0 prevents this slack from transferring to the upper half of the trolley chain. 6. Use the slack in the chain to lower the chain below the drive gear so that it is not in contact with the drive gear. Bring the chain approximately 1/4" to the outside, to be certain it is fully decoupled from the drive gear. 7. While the first person continues to hold the tension on the upper half of the trolley chain, and watches to ensure that the chain remains disengaged from the drive gear, have the second person go in to the ACP and pulse the ACP to gradually bring it to the 60° position (to match the physical position of the trolley). Be sure to go slowly enough to allow the person at the occultor to keep the chain away from the gear. (If there is a slip that changes the trolley position, place the trolley back at 60° and continue). 8. Still holding the trolley chain on the upper idler gear, pull the chain back around the drive gear and the second idler. You are trying to pull the chain into position so that when it is fully engaged, it will not change the trolley physical position significantly 9. Reinsert the cross member at 30° to bring normal tension back on the chain. 10. Verify that the tension of the chains on the upper and lower portion are about equal; if not, repeat steps 8 and 9 so that they are. 11. Exercise the occultor manually using the ACP to verify it's running smoothly and aligned properly before turning WSI back on. Technical Note 241 Page36 idlers at 30° Idler gear (on both sides) - 300 ha Trolley chains - 0°idler Idler gear (on both sides) drive gear Drive gear Drive chain Fig. 4-4a Side view, with trolley chain engaged Trolley Drive Fig 4-3 Front View, from North Arc near trolley drive. removed crossmember Support plate not shown. Fig 4-5 Side view with trolley chain disengaged from drive gear hanging loose lower chain Fig 4-4b Side view with larger idlers hold chain here 0°idler drive drive gear Docslcamillelcontr.docs. gear Technical Note 241 Page 37 4.8 Power Up Sequence from Setup Instructions This section lists the power-up procedures from the Setup Instructions. This is the detailed procedure to use for system check. Under normal conditions, when detailed checks are not required, it is adequate to cycle power and let the WSI do its self-start. Note the time. If in a moist environment, be sure that 1-3 hours have elapsed since the environmental housing doors were sealed with the desiccant in place. Do a final visual inspection of the White Box for abnormalities. Do a final visual inspection of the Blue Box for abnormalities. Verify that front switches are in the "off" position on both ACP's, the SCSI (exabyte) rack, and the computer. Plug the small diameter orange power cord into the UPS. Plug the large diameter orange power cord into a power strip or UPS. Plug the Blue Box power cord into an UPS. Verify that the computer is off, so you can check the ACP's before the computer takes over. Turn the Sensor ACP power on, and the local enable on. Verify that the filter changer wheel on the Sensor ACP is operable. Verify that the panel meters on the Sensor ACP come up. Turn the Occultor ACP power on, and the local enable on. Verify that both the arc drive and trolley drive on the ACP can be changed. Compare the arc physical position with the ACP panel meter. In normal shipping configuration, the arc should be at 10 degrees above horizontal toward the East, and the panel meter should be near 10. Compare the trolley physical position with the ACP panel meter. In normal shipping configuration, the trolley should be at 45 degrees from North, and the panel meter should be near 45. If the arc or trolley positions are not consistent with the ACP positions, refer to the ACP alignment procedures (to be included in the Trouble Shooting Manual). It is important that the ACP readout matches the occultor position before the computer is turned on. Turn on the upper switch on the SCSI rack (TWP and NSA only). Technical Note 241 Page 38 Before the computer is turned on, note that if you are familiar with OS2 you MUST NOT put the primary program in the background. OS2's handling of graphics programs will cause the acquisition program to become inactive while in the background. Turn on the computer. Verify that it and the monitor comes on. When the computer arrives at the OS/2 or DOS choice, choose DOS. Change to the D drive by entering D: Change to the WSITEST directory by entering \WSITEST. Run program RTGRAB by entering RTGRAB and following the instructions. This program will grab images every 8 seconds when set on exposure = 100 msec, and allow you to see the images. In RTGRAB, verify that images are being acquired by the camera. Change the filter positions, and verify that the image changes (remember that the response is not instantaneous). Change the occultor position, and verify that the image changes. Check the Sensor ACP panel readings for normal: Camera housing less than 32, generally near 16 Chip temperature near -40 Environmental housing up to 32, generally near 16 Flow rate above .125, generally near .25 N2 pressure above 2, generally near 4 RH below 99% (below 30% after it has been sealed for a day). Return the ACP local enable to off. Check the input file for the correct local lat, long, and site ID, as follows. Enter "MS RUNWSI.INP". Use the down arrow to find the appropriate input lines. If it is necessary to change them, use the right arrow to get to the right space, enter the corrected values by typing them in, and use the Del key to remove the old values. Once all 3 lines are done, check them to verify that you have preserved the format. To exit, press the "F10" key, followed by "f", "q", and "y". Install 3 tapes in Tape drives 1-3 in the drive rack under the ACP's by pressing the buttons, and inserting the tapes in the open doors. Reboot the system by entering Ctrl Alt Del. Technical Note 241 Page 39 Verify that the WSI goes through normal start-up procedure documented in Memo AV95-016t (Appendix A). 4.9 Replacing the Desiccant The desiccant is designed to keep the inside of the environmental housing reasonably dry. The relative humidity inside the housing is monitored and displayed on the Sensor ACP. This relative humidity will naturally rise whenever the door has been opened, especially if it is cooled right after the door is open. The desiccant can be replaced whenever the chamber remains damp. If the door has remained shut for 24 hours, and has been cooled during this time, and the relative humidity remains too high, it is time to replace the desiccant. We are not yet certain how dry the desiccant will keep the chamber, but as an initial value, we would estimate that the desiccant should be changed whenever the relative humidity remains above 50%. The desiccant canister is the grey cylinder housed on top of the camera electronics unit in the environmental housing. To replace it, remove the canister and use the spare canister. The canister should then either be dried as documented in Appendix D, or be replaced. 4.10 Inspect All Seals, Grommets, and Screws Inspect the grommet material which is used on the top of the sun shade, and around the subassembly covers on the occultor. These may craze, but if they appear to be cracked enough to allow leaks, they should be replaced. Inspect the environmental housing top. RTV has been used where the insulating ring meets the metal, and where the screws penetrate the top (both on the ring and on the metal top). If any of these appear to be leaking, replace or repair the RTV seals. Inspect all other penetrations which are exposed to the weather. Normally, screws are sealed with RTV or sealing screws, shafts have seals, and standoffs are sealed with RTV. If there is any evidence of water penetration into locations such as the inside of subassembly cases, these items should be resealed. Inspect screws which go into the standoffs on the occultor arc. Since the screws go into delrin, they cannot be tightly tensioned, but they should be fully engaged. RTV may be used if any become stripped. Make a general inspection of the white box and occultor to verify that components appear to be normal. appear to be sentral ins Technical Note 241 Page40 5. REPLACING LINE REPLACEABLE UNITS This section describes how to replace the line replaceable units. Standard technician level skills are assumed by the person replacing the units. Thus we have not detailed standard skills such as replacement of computer cards. 5.1 Replacing the Camera Housing and CEU If the camera fails, we recommend replacing the complete camera housing and Camera Electronics Unit (CEU) through MPL, so that the camera can be refocused and recalibrated as necessary. The following instructions are based on a new camera housing and CEU having been received in the field from MPL. 5.1.1 Removing the Camera Housing 1. Turn off the WSI and disconnect all power to the system by unplugging the two orange power cords and turning off the power to the blue rack. 2. Remove the sunshade from the top of the camera housing. 3. Remove the two annular-shaped (ring) pieces of foam insulation from the top of the camera housing. 4. Open the west door of the environmental housing. 5. Remove the black foam holding in the lexan window, remove the window, and set it and the foam aside in a safe place. 6. Disconnect the nitrogen sensor cable connectors which lead from the sensor on the bottom of the camera housing. 7. Disconnect the temperature cable connector. This is a smaller cable labeled "Camera Hsg TEMP" which connects to the bottom of the camera housing. (See Fig 5-1.) 8. Disconnect the cable for the filter changer and shutter; this connector, labeled "Filter changer", should be disconnected from the bottom of the camera housing. 9. Find the Camera grounding plug, a small blue plug which is stored in the environmental housing. This will be used in the next step. 10. Find the grey camera cable which comes from the Camera Electronics Unit (CEU) and is labeled "Cable, Camera Head CH250", and is connected into the back of the camera. Remove this cable, and IMMEDIATELY attach the camera grounding plug. 11. Find the two tygon tube coolant fluid lines, and note the disconnects near the camera. (Fig 4-1) Only the female connectors have a liquid cutoff (in order to avoid too much pressure loss through cutoffs), so you will need to be prepared for some leaking. Have plenty of paper towels under the tubing, if there still is water in the tubes. Technical Note 241 Page41 12. Disconnect the two tygon tube coolant fluid lines to the quick disconnect lines emanating from the base of the CCD camera. Connect the two tubes coming out of the back of the camera to each other. 13. Using the remaining male connector, drain the liquid from the reservoir, then connect to the remaining female connector. Clean up any spilled water. 14. Unscrew the nylon screws which hold down the flange of the camera housing to the environmental housing. Save these in the baggie marked "camera housing". 15. With your arms inside the environmental housing, lift the camera housing up out of the lid, and have a partner lift it on out, being careful not to hit the connectors underneath or to mar the dome. 16. Disconneet the coolant disc 16. Disconnect the coolant disconnects, drain the camera, and reconnect the disconnects. Fig 5-1 WSI Camera Housing Connections Bottom View 11 Aug 95 Pressure sensor To env. hsg. internal wring . M Coolant Cam Hsg Temp - - - To env. hsg. internal wring To env. hsg. internal wiring Coolant Filt Chg & shutter :: :: Camera To CEU Technical Note 241 Page42 5.1.2 Installing the New Camera Housing 1. Verify that the red rubber ring is seated on the top of the nylon support ring in the top plate of the environmental housing. 2. Remove the lid from the top of the camera housing crate. Lifting the camera housing by its large support ring (not by the lid), remove the camera housing, being sure to save all bolts and packing material. 3. Loosen the thumb screws on the camera housing lid and remove it. 4. Position the camera housing unit above the top plate of the environmental housing. Rotate the camera until the largest connector on the bottom is to the south. Lower camera unit until the camera housing is seated on the nylon support ring. 5. Partly insert the 8 screws in the baggie marked "camera housing" 6. Align the camera so that the screws are in the center of the slots. 7. Once the camera housing is properly aligned, screw the camera housing to the nylon support ring being careful not to over tighten the screws (the nylon threads are easily stripped). 8. Place the two rings of black insulation over the camera housing flange. (One of these was set aside in Step B, and the other is normally shipped in the camera housing box.) 9. Remove the 8 bolts which secure the occultor, then replace the sunshade and replace the outer 4 bolts. 10. Connect the two tygon tube coolant fluid lines to the quick disconnect lines emanating from the base of the CCD camera. 11. Find the grey camera cable which comes from the Camera Electronics Unit (CEU) and is labeled "Cable, Camera Head CH250"; this will be used in the next step. It is normally shipped in the cable box. 12. Remove the Camera grounding plug on the back of the CCD camera, place on the inside shelf of the environmental housing, and IMMEDIATELY attach the free end of the camera cable, being careful not to reverse the cable. 13. Connect the cable for the filter changer and shutter; this connector, labeled "Filter changer", should be connected to the bottom of the camera housing. 14. Connect the temperature cable connector. This is a smaller cable labeled "Camera Hsg TEMP" which connects to the bottom of the camera housing. 15. Connect the two nitrogen sensor cable connectors; one leads from the sensor on the bottom of the camera housing, and the other is part of the cable bundle on the housing shelf. Both are labeled "Pressure sensor". Technical Note 241 Page43 5.1.3 Replacing the CEU 1. Open the East door of the environmental housing, and remove the lexan window with its foam insulation. 2. Disconnect all 4 connectors from the CEU; the temperature (BNC), shutter, camera cable, and controller cable (See Figs. 5-2 and 5-3). 3. Remove the plastic cover which protects the terminal blocks on the right hand side of the CEU. 4. Disconnect the right hand sides of the terminal blocks, noting the wire sequence (e.g. black and clear on the 2-terminal block, and black, white and green on the 3- terminal block, counting from the front; may differ on different units). 5. Remove the four screws which hold the CEU mounting plate to the environmental housing shelf. 6. Lifting the CEU mounting plate at the left edge first, angle it out of the environmental housing, being careful not to tear the insulation. 7. Remove the CEU by removing the screws which are under the mounting plate and which hold the CEU to the mounting plate. 8. Mount the replacement CEU onto the mounting plate with these same screws. 9. Carefully place the CEU mounting plate back on the environmental housing shelf. 10. Connect the CEU mounting plate to the environmental housing shelf with the four screws used in Step 5. 11. Reconnect the two terminal blocks, being sure to use the same connections noted in Step 4. VO 12. Return the plastic cover removed in Step 3. 13. Reconnect the four connectors removed in Step 2. MIO Technical Note 241 Page 44 Fig 5-2 WSI Environmental Housing Connections, Rear View 11Aug 95 | cu Temp. to internal wiring Shutter to cam To camera Cam cntri Power su :::: 6501 - 03 . L 6 % 3 3 | CamCtrl TE Pump Meter Cable bundle Note: Internal wiring breakouts not shown Fig 5-3 CEU View from side Temp, to internal wiring to O . Shutter, to camera To camera . ." a . .. O . . ** . . . . * . . . . : . . .. . % . : . . ***... . . . . . . ' . . . . .. -To cable bundle, Cam Ctrl ' . ... ' . . ' O ***** . . ' . . LT . . . .. '. * . . . . . . . . ****: . . . . ." . . **:,:** . . O . 6. ** .. . . . . . . ... . . . .. . . * . . To pwr cord camillelcnu.docs.JES auhor Technical Note 241 Page45 5.1.4 Powering Up and Completing the Camera Replacement 1. Complete the power up sequence given in the setup instructions, and verify that the system is operating normally. 2. Replace the lexan windows, and shut the environmental housing. 3. Inspect the WSI to be sure you did everything, and that the WSI appears normal. 4. Normally, the damaged camera housing/CEU may be prepared for shipment to MPL at this point. 5.2 Replacing the Acrylic Dome Please see the Maintenance section 4.5 for instructions on replacing the camera housing dome. 5.3 Replacing the Teca Cooler This procedure is for replacing the Teca Cooler, the large brass cooler on the center of the environmental housing shelf. This installation was designed for the best thermal properties, rather than the easiest reinstallation. Individual units may vary; if it is easier to remove the shelf or follow a slightly different procedure from that given here, this is the option of the technician. 1. Turn off power to the environmental housing by disconnecting the two power cords and turning off the blue box. 2. Open the East door of the environmental housing, and remove the lexan window. Store the desiccant in a sealed container. 3. Disconnect all 4 connectors from the CEU; the temperature (BNC), shutter, camera cable, and controller cable (See Fig 5-1). 4. Remove the plastic cover which protects the terminal blocks on the right hand side of the CEU. 5. Disconnect the right hand sides of the terminal blocks, noting the wire sequence, and verifying that it is consistent with Fig 5-4. Remove the four screws which hold the CEU mounting plate to the environmental housing shelf. 7. Lifting the CEU mounting plate at the left edge first, angle it out of the environmental housing, being careful not to tear the insulation. 8. Having completed step 7, you should have sufficient access to get to the cooler. In the next steps you will be preparing the cooler to be dropped down through the environmental housing shelf. If you feel you do not have sufficient head room, you may also remove the camera housing as described in Secn 5.1.1, but this should not be necessary. Technical Note 241 Page46 9. On the north side of the cooler (not the side where the air blows out) and immediately adjacent to the cooler, cut a piece of insulation which is 1/2" by 10" and parallel to the side, completely through the insulation layer. Remove this piece, exposing the nuts which hold the cooler in place. Do the same on the south side of the cooler. 10. Disconnect the signal cable from the cooler at the cooler, and bring the power cord up on the cooler where it will not interfere with removal of the cooler from the shelf. 11. Brace the cooler so it cannot fall, then remove the 8 nuts which hold the cooler in place. Carefully remove the cooler from the bottom of the shelf, allowing the power cable to come through the hole in the shelf. The cooler is heavy, so this may require two people. 12. Bring up the new cooler up into the hole in the shelf, first feeding the power cable up through the hole. Reattach the 8 nuts removed in step 11 to hold it in place. UP 13. Reconnect the signal cable disconnected in step 10. 14. Replace insulation removed in step 9. 15. Power up the cooler, to make sure that it comes on OK. Once you are comfortable with its operation, the CEU can be replaced as note in the following steps. 16. Carefully place the CEU mounting plate back on the environmental housing shelf. 17. Connect the CEU mounting plate to the environmental housing shelf with the four screws used in Step 6. 18. Reconnect the two terminal blocks, being sure to use the same connections noted in Step 5. 19. Return the plastic cover removed in Step 4. 20. Reconnect the four connectors removed in Step 3. 21. Inspect to be sure that the mounting appears as it did before, and any tie wraps which were disconnected are reconnected, and any trash removed. 22. Reconnect power, and power up the WSI. Verify that you are getting a reasonable environmental housing temperature reading (near ambient and dropping) on the ACP. . Once you are satisfied that the installation was successful, turn power off, replace the desiccant canister, seal the environmental housing, let it sit for an hour to allow the desiccant to absorb some of the moisture introduced during repair, then power up and re-check the system. Technical Note 241 Page47 5.4 Replacing the TE Controller This procedure is for replacing the TE controller, i.e. the controller which controls the cooler. If procured from MPL, this will come already programmed. If procured directly from the vendor, it will be necessary to program the controller in accordance with the controller operations manual, and in consultation with MPL so that a consistent setup will be used. 1. Turn off power to the environmental housing by disconnecting the two power cords and turning off the blue box. 2. Open the East door of the environmental housing, and remove the lexan window. Store the desiccant in a sealed container. 3. Open the West door of the environmental housing, and remove the lexan window. 4. Find the vertical panel near the South-west end of the environmental housing shelf which holds the controller and the flow meter. Remove the two screws near the base of this panel, and lower the panel down for access to the back of the controller. 5. Note how the three cables which go to the back of the controller are hooked up, and compare them with the wiring diagram shown in Fig 5-4. Note any errors in the . drawing, and then disconnect the three cables. 6. There is a white plastic piece which holds the controller tight against the mounting panel. Lift the white tabs on the four sides of the controller enough to slide this piece off the controller, and then slide the controller out through the front of the panel. 7. Mount the new controller in the panel using a white plastic piece as noted in step 5. 8. Reconnect the cables which were disconnected in step 5. 9. Reconnect the vertical panel which was disconnected in step 4. 10. Inspect to be sure that the mounting appears as it did before, and any tie wraps which were disconnected are reconnected, and any trash removed. 11. Reconnect power, and power up the WSI. Verify that you are getting a reasonable environmental housing temperature reading (near ambient and dropping) on the ACP. 12. Once you are satisfied that the installation was successful, turn power off, replace the desiccant canister, seal the environmental housing, let it sit for an hour to allow the desiccant to absorb some of the moisture introduced during repair, then power up and re-check the system. Page48 Fig 5-4a Environmental Housing Schematic pol CL RCUSIONS asawong noco mwo SIMSOR sosur C . 6501-03-P1 LO K 10 сли можно с SHQT RACER CCO CHIP C w she NU RED a SSRI SHEET 2 TC coun THERMAL ELECTRIC CONTROLLER (OMEGA CN76000) SMOL 2ORN HO U 5 SU w it COOUR- SHOT 2 au APROAPARRADA wa W ID a Such ou cu SHQ 135 a SLO El TETET PRESSUNC SENSOR CONN SKCIAL WHTI NI PRESSURE SWITCH (SMC) ncol 12 VOC CHO کیا مه cu SUNCED BUK BCO * t Out NI CAT SICU SWI-NO SVI-MC SW1-C DIGITAL FLOW METER (PROTEUS INDUSTRICS) CWU MOUSWC C NOW RATE cru N2 PRESSURE non « CM XUOMO HUMONTY CAMERA POWER RE CONTROLLER ALARY NOT SWITCH ALARM massume SMICH alam I massume SWICH ALARM 2 412 VOC AC MOT AC MOUT AC CND SMICT CAMERA HOUSING UKIWI WI 1 [ Out CATW REO) 90 DIGITAL FLOW METER RIN DISPLAY AC MOI (PROTEUS INDUSTRIES) HAC MOUT AC CHO 1 ) CAMERA SHO NEUTRAL DENSITY (PHOTOMETRICS) RCO 6501-03-P1 12 VOC nom u 12 VOC ORN Mums wwe con 1/2 * Ich WT 107CRN соң 1 Kolam COM) mimo WORD com 4 WIRED ONY RD POSW WO MI KOC ro Om Co WT um TD con I WIDE RD ом 1/2 ORN com ? con 3 wu cow 3/4 w MDL con 4 ORNAL GROUND GROUHO ww MI 12 Voc 200 W CHO 12 VOC MT S n any #INT*> N H = 8 بیا 20 20 پی 20 0/10/94 8/10/94 8/10/94 0/10/94 0/10/94 8/10/94 8/10/94 8/10/94 8/18/94 8/10/94 8/10/94 0/18/94 8/18/94 8/10/94 8/10/94 پی 2012W . 2014W 2016W 2010W 2020W 2022W 2024W 2026W 2020W 2030W 2032W 2034W 2036W 2030W 2040W 17 17 17 17 34 34. 34 120000 120000 120000 120000 120000 120000 120000 120000 120000 120000 120000 120000 120000 120000 120000 20 ܝܕ ܝܕ ܝܕ ܝܕ ܝܕ ܝܕ ܝܙ ܝܕ ܝܙ ܝܕ ܢ ܝܕ ܢܟ ܢܟ ñ ooOOOOOOOOOOOOO پی 0.23 1 0.23 1 0.23 1. 0.23 1 0.23 1 0.23 1 0.23 1 0.23 1 0.23 1 0.23 1 0.23 1 0.23 1 0.23 1 0.23 1 0.23 1 ܝܕ ܝܕ ܝܙ ܝܙ ܝܙ ܝܙ ܝܙ ܢܙ ܝܕ ܝܙ ܝܕ ܝܙ ܝܙ ܝܕ پی 34 20 17 پی 10 17 34 0 2 0 0 20 20 20 17 پی 17 پی 20 11 12 13 11 15 34 34. 34 31 پی wwwww پی - 1 17 17 17 1 25 20 Fig 7-1 34 -35 20 25 Column 1,2 Dalc and Timc - Dalc and limc image was grabbed. In this cxamplc thc sourcc of thc limc is thc WWV clock. Column 3 Iing It - The number of imagc scls grabbcdimagc scl scqucncc number Column 4 Acq modc - Type of imagc scl grabbcd. Acg modc 1 - Red, Bluc spccual fillcr grab scqucncc. Acq modc 2 - Clcar ſilicr grab Column 5 Spg | - Spectral fillcr scqucncc uscd (or imagc scl. In this cxamplc, imagc scl I consists of a red imagc, bluc image and dark image. The remaining imagc scls consist only of red and bluc images. Column 6 ND - Nculral density fillcr uscd during image acquisition. Column 7 Exp - Camcra cxposurc in milliscconds Column 8 Cam - Camcra housing (cmpcralurc (°C) Column 9 CCD - CCD chip tcmpcralurc (°C) Column 10 Eny - Environmental housing (cmpcralurc (°C) Colunun 11 Flow - Coolant flow in gallons per minulc Column 12 N2 - Caincra housing pressurc in pounds per squarc inch Column 13 RH - Rclalive humidil Column 14 R - Rcd flag indicator column Column 15 Y - Yellow flag indicator column In this examplc, a yellow Pag was scl al limc 2030 bccausc thc cnvironmental housing \lcmpcralurc went abovc 32°C. Page97 Technical Note 241 Page98 Table 7.1 Function Normal | Yellow Flag Level Red Flag Level Camera Housing Temperature (°C) 16 >32 >49 CCD chip temperature (°C) -35 >-30 >0 Environmental Housing Temp (°C) >32 >49 Coolant flow through camera (gpm) 25 5.09 5.125 <2 Nitrogen pressure of camera housing (psi) | *Spectral filter errors (Unable to put filter into specified position) <10% >10% >90% <10% 210% >90% *Neutral density filter errors *Arc, trolley occultor errors. Type (Occultor is not in specified position) <10% 210% >90% <10% >10% 290% *Arc, trolley occultor errors. Type 2 (A time out occurs before occultor reaches specified position) No camera response (If the camera does not respond for any one grab, a red flag is set) No WWV. (If the source of the time stamp on all the images grabbed is not WWV, a yellow flag is set) = # of images · grabbed >10% *Exabyte error (unable to write to Exabyte) * Error figure = # of occurrences / # of images grabbed Technical Note 241 Page99 Table 7.2 Summary of Red Flag Idents Red Flag Codes - nwa anavooo Ö = N2 pressure SP error > = 90 ND error: >= 90 Trolley mismatch >= 90 Arc mismatch 290 No trolley 290 No arc > 90 No camera response > 1 Camera temp Flow rate Env. housing temp CCD temp Table 7.3 Summary of Yellow Flag Idents Yellow Flag Codes ū No WWV N2 pressure Exabyte error SP error ND error Trolley mismatch Arc mismatch NW Aaravo Ö No trolley No arc Camera temp Flow rate Env. housing CCD chip Technical Note 241 Page 100 Figure 7-2 Sample Day Night WSI Header Table Site:HEL Lat=32.63 Long=106.33 File:03292239.red Day=29 Month=3 Year=93 Time=22392 Exposure=100 mis ND=2 SP=3 Occultor Destination: Arc=123. 7Trolley= 98.2 Housing Temp=16 Hardware Ver:1.0 Software Ver:2.0 Time Stat : . N2 pressure=5 Flow rate=.25 Env. Housing Temp=16 CCD Chip Temps- 35 Occultor Position: Arc=111.8 Trolley= 99.7 Rel. Humidity= 20 000000000000000000000000000 PSSUI -. .. Site:HEL Lat=32.63 Long=106.33 File:03292239.blu Day=29 Month=3 Year=93 Time=22392 Exposure=100 ms ND=2 SP=4 Occultor Destination: Arc=123. 7Trolley= 98.2 Housing Temp=16 Hardware Ver:1.0 Software Ver:2.0 Time Stat : N2 pressure=5 Flow rate=.25 Env. Housing Temp=16 CCD Chip Temp=- 35 Occultor Position: Arc=111.8 Trolley= 99.7 Rel. Humidity= 20 000000000000000000000000000 Site:HEL Lat=32.63 Long=106.33 File:03292239.drk Day=29 Month=3 Year=93 Time=22392 Exposure=100 ms ND=2 SP=1 Occultor Destination: Arc=123. 7Trolley= 98.2 Housing Temp=16 Hardware Ver:1.0 Software Ver:2.0 Time Stat : N2 pressure=5 Flow rate=.25 Env. Housing Temp=16 CCD Chip Temp=- 35. Occultor Position: Arc=111.8 Trolley= 99.7 Rel. Humidity= 20 000000000000000000000000000 Technical Note 241 Page 101 1 o CCD chip. Env. housing 1 O CCD temp. O Env. housing o 2 Flow rate Flow rate Camera temp. 2 3 4 lololololol 5 6 Camera temp. No arc No camera response_ No trolley Arc mismatch Tables 7.4 and 7.5 O No arc O No trolley 7 Trolley mismatch Arc mismatch Red flag string Table 7.4 3 4 5 6 7 8 101010101010101010101 13 12 11 10 9 Yellow flag string 8 12 11 10 9 10 10 10 10 10 Table 7.5 Trolley mismatch ND error SP error O ND error o SP error Exabyte Error N2 pressure N2 pressure NO WWV Technical Note 241 Page 102 8. HANDLING THE OPERATING SYSTEMS While some WSI units run directly under DOS, others run under OS2 depending on the needs of the sponsor. This section discusses the special requirements of the systems running under OS2. Those units running under OS2 are actually running in a DOS session controlled by OS2. They may also be run autonomously directly under DOS by booting to DOS and typing RUNWSI. OS2 is used to enable communication via a sponsor-provided communications program. Because of special features within the RUNWSI program, RUNWSI must be run in a true DOS session under OS2 rather than directly under OS2. When you turn on the computer, it will boot to OS2 within one minute. The RUNWSI program is then automatically initiated under a true DOS session. Special icons have been set up to run the data acquisition program, and no additional input is required from the user. These icons are in the Start Up folder and on the OS2 desktop. For more information on the OS2 Start Up folder and OS2 desktop, refer to the OS2 version 2.1 Operating System manual. If you exit from RUNWSI by pressing the 'X' key, you may restart the program from the command line by typing "runwsi". If you have any problems, follow the shut down procedures outlined below, and do a hard reboot of the computer. If it is necessary to shut down the WSI computer, do not just turn power off to the computer system. Diagnostic data may be lost if the following procedures are not used. First exit the RUNWSI program. To exit RUNWSI, press the 'x' key anytime after the first image has been acquired and archived. Next close all open sessions by pressing the CTRL and ESC keys simultaneously, to access the OS2 Window List. A window showing all open sessions is displayed. Use the up or down arrow key to highlight the RUNWSI title in the Window List. Click the third mouse button to close the window. Repeat this procedure for all titles in the Window List, except for the Desktop title. Answer yes to each confirmation prompt. After closing all windows and sessions, follow the shut down procedure shown in Figure 2, of memo AV95-028t, in Appendix B. Failure to use shut-down procedures will not damage the instrument, but will result in loss of diagnostic files. Appendix A MARINE PHYSICAL LABORATORY, 0701 of the Scripps Institution of Oceanography San Diego, California 92152-6400 April 20, 1995 AV95-016 TECHNICAL MEMORANDUM To: From: Atmospheric Optics Group M. E. Karr Subj: Normal WSI Computer Control Display During Boot-up and Program RunWSI The WSI Day/Night acquisition program is called RunWSI. This memo, documents what happens when the WSI computer system is powered up, assuming that there are no problems. When the computer is turned on, it first goes through a series of power on self tests, which includes some memory tests. Then the SCSI card is reset. After the SCSI card is recognized, the OS/2 Boot Manager menu is displayed. See figure 1. Boot to OS/2 by using the up or down arrow keys to highlight the OS/2 line and then press the return key. If a user is not present to respond to the Boot Manager menu, the computer will automatically boot to OS/2 after a one minute delay. Next the Ethernet card and TCP/IP drivers are recognized and loaded, the screen will then blank and you will see a small clock in the center of the screen. The OS/2 desktop appears briefly. The desktop display is then replaced with the RunWSI display. See Figure 2. The next message to come up on the screen, let's the user know that the Exabyte will be skipping to the end of data on the tape (EOT). See Figure 3. This takes at least 30 seconds. Then an initial end of file mark (EOF) is written to tape. Following the Exabyte initialization procedures, the occultor is moved into position. See Figure 4. After the occultor is set into position, we wait for the first image grab. See figure 5. The first image grab occurs approximately two minutes after the RunWSI initialization procedures have been completed. Each subsequent grab is at 10 minute intervals. The right hand column of the RunWSI screen shows the parameters of the current image on display and the status of RunWSI. In figure 6 we see a typical Run WSI screen after an image grab. Figure 6 shows a red image acquired on 30 Mar. 95 at 1732Z. The exposure is 100 milliseconds. The neutral density position is 3 and the spectral position is 3. The threshold used to display the image is 1000 - 3300. Run WSI is waiting for the next image grab at 1742Z. A reminder at the bottom of the screen lets the user know that by pressing the 'X' key, we can exit the RunWSI program. A-2 After seven days it is time to change tapes. Use hotkey option T to change tapes. See figure 7. Answer 'y' or 'l' (yes) to the question -- "Do you want to change Exabyte tapes?". The tape in the first tape drive is rewound and ejected. The data period contained on each ejected tape is displayed. Label each ejected tape with the proper data period. The cleaning process is next. Press the RETURN key when the cleaning process has been completed. Place a new tape into each empty tape drive. Wait until the bottom green LED is a solid green before pressing the RETURN key. The Run WSI program will continue to run indefinitely until a user presses the 'x' key to exit the program. Marette Boot Manager Menu . . : : W .. . . 0! . . . . . .. . SANOS . A-3 . . XXX VR R . . . . A . 32. W WOWOK . SER .. Hot . SOSY . 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O . . . . ISTAS ... . . ...... . . .. ... . .. .. .. ... 00 .. O ...... . .... .. . . . .... - 0 .. 50t CA .. . 1 . 30 $$ ë - + + + TU . O . . . . . + 1 1 . 1 : B . . X. ssejd To exit .. . grab at 1742Z Waiting for Max - 3300 Min = 1000 ND = 3 SP = 3 Expose = 100ms Soort Timez Red Image . D . ... ; r. - . į S .! . . Change Exabyte tapeş?: (1 = yes, 0 = no): 1 A-9 Wait... writing last EOF to drive 1 Wait... unloading tape in drive 1 Label tape in drive 1: Start date: 3/16/95, End date: 3/23/95 Check Exabyte status lights. If the top and bottom LEDs are flashing on an Exabyte drive, please insert an Exabyte cleaning tape into that drive. Also, if it has been two weeks since an Exabyte drive has been cleaned, please clean it. Each Exabyte drive should have its own cleaning tape. After cleaning a drive, label the cleaning tape with the current date. Press the ENTER key when you have finished the cleaning process. Insert new tapes into each empty tape drive. Press the ENTER key after the tapes are loaded and the bottom green LED on each Exabyte drive has stopped flashing. Figure 7 Option 'T' - Change Exabyte tapes Appendix B MARINE PHYSICAL LABORATORY, 0701 of the Scripps Institution of Oceanography San Diego, California 92152-6400 September 27, 1995 AV95-028t TECHNICAL MEMORANDUM To: From: Atmospheric Optics Group M. E. Karr Subj: RunWSI (WSI Data Acquisition Program) Operations Overview - Update The attached list highlights the main operating procedures for the Whole Sky Imager data acquisition program RunWSI, version 4.0. For the user who wants to quickly boot up the WSI, a quick start guide is provided. A brief description of the RunWSI function and common OS/2 operating procedures is also included. For more detail on the Run WSI program and operating instructions, please refer to the Run WSI Program Description document and the WSI Operations Manual. This memo contains an updated hotkey description list and the new version of the Run WSI input file. Manettle B-2 Day/Night WSI Computer Operations Checklist (Apr. 95) Quick Start - How to run the Day/Night WSI acquisition program 1. Turn on power to the computer, Occultor ACP, Filter Changer ACP and external Exabyte chassis. 2. Wait for Boot Manager Menu screen. This takes about 20 seconds. . To boot OS/2, highlight the OS/2 line using the up or down arrow key. Press the ENTER key when finished. 4. Wait for the OS/2 operating system to finish initializing. This takes about 30 seconds. 5. When OS/2 has completed its bootup procedures, the TCP/IP communications protocol setup program, RunWSI, and DropShipper are all initiated. The TCP/IP setup session will conclude when it has completed its setup procedures. This takes only a few seconds. The RunWSI start up screen is displayed. DropShipper will run in the background. What is the RunWSI program doing? Setup Procedures: When the Run WSI program is started up, it first resets the tape drives and sets up the camera and processing functions. If the camera's CCD chip temperature is above 0°C, then the WSI system will wait for up to 5 minutes for the temperature to decrease below zero. Under normal conditions, the camera setup procedure takes approximately 30 seconds. The next operation performed is with the Exabyte 8mm tape drive. The tape is forwarded to the End of Data (EOD) mark. All existing data will be preserved. The final Exabyte setup task is to write an initial End of File mark to tape. The occultor setup procedure is next. The solar/lunar occultor is positioned according to the time of day. Data Acquisition: The first image grab occurs two minutes after the occultor position is set. Each subsequent grab occurs at the preset acquire interval of 10 minutes. After each grab the following takes place: 1) Data archival -- All images grabbed are saved to tape. The most four recent image sets are also saved on the hard disk. A sample image and current diagnostic status are sent to the DropShipper directory. 2) The occultor is positioned for the next image grab. 3) RunWSI waits until it is time for the next image grab. Data acquisition will continue until the user presses the 'X' key to exit RunWSI. End of Data Archival Period: After seven days it is time to replace the tape in Drive 1 with a blank tape. Press the "T" key to perform the tape change procedure. Follow the procedures displayed on the screen. See figure 1. After the ejected tapes have been labeled, clean each Exabyte drive as necessary. Each drive should be cleaned every two weeks. After inserting blank Exabyte tapes into each empty tape drive, press the ENTER key to continue collecting data. Note that the user is not prompted to change tapes each week. Data acquisition will continue indefinitely, however data archival will be discontinued when all tape drives have been used and the hard disk becomes full. We strongly recommend changing tapes each week to avoid the possibility of partial tapes and loss of data. Shutdown procedures If it is necessary to shut down the WSI computer, do not just turn power off to the computer system. Data may be lost if the following procedures are not used. First exit B-3 the RunWSI program. To exit RunWSI, press the 'x' key anytime after the first image has been acquired and archived. Next close all open sessions by pressing the CTRL and ESC keys simultaneously, to access the OS/2 Window List. A window showing all open sessions is displayed. Use the up or down arrow key to highlight the RunWSI title in the Window List. Click the third mouse button to close the window. Repeat this procedure for all titles in the Window List, except for the Desktop title. Answer yes to each confirmation prompt. After closing all windows and sessions follow the shut down procedure shown in figure 2. Power outage: If there is a power outage, the WSI computer will reboot itself when power becomes available. The OS/2 operating system will start up and then the Run WSI program will automatically begin acquiring data. RunWSI Precautions: The WSI acquisition program is designed to run unattended. The only user interaction required besides powering on the WSI components, is to exchange tapes each week. The OS/2 operating system requires that programs that display graphical information run in the foreground in order to remain active. It is therefore important that the user does not change sessions during active data acquisition. If RunWSI is placed in the background just before it is time to grab an image, RunWSI will not acquire the image until the program is brought back to the foreground. For more information on changing sessions during data acquisition, refer to the WSI Operations Manual. How do I change the Run WSI input parameters? There are two ways to change the operating parameters. Some Run WSI options can only be changed by exiting from the acquisition program and then editing the RunWSI input file, RunWSI.INP. A sample Run WSI.INP file is shown in table 3. Other options can be changed while the RunWSI program is running, via hotkeys. The hotkey options are described in table 1. Options for DropShipper can only be changed by editing the input file Run WSI.INP. To edit this file, first exit the Run WSI program by pressing the 'X' key. Use a text editor of choice to edit the Run WSI.INP file. The DropShipper parameters used by RunWSI are at the bottom of the file. You can change the pathname for DropShipper files and you can choose to send or not send DropShipper files. Enter a 'l' to send files or a 'O' to not send files. If the ARCs network is down, do not send files to the DropShipper directory. To restart data acquisition type "RUNWSI" at the keyboard. Hotkey Options: As mentioned earlier, RunWSI is designed to run unattended. However, the user may change any of the parameters described in table 1. Because changing the input parameters and reviewing imagery can affect data acquisition, there are several methods to disable hotkey access. Method #1: Change the Allow Hotkey Access option in the RunWSI.INP file to 0. If hotkey access is disabled the only options available to the user are the health and status check (option 'S') and exit RunWSI (option 'X'). To enable the all hotkey options, the user may enter a password after selecting an option. For example, if the user wants to change the acquire interval, press 'T' at the keyboard. The user is notified that hotkey access is disabled. The user then has the option to enter a password to enable the hotkeys. Method #2: Remove the keyboard from the front of the WSI computer system and store until needed. B-4 How can I check the WSI performance history? Anytime after the first image set is acquired, the user can check the status of the Whole Sky Imager. Press the 'S' key to view the status tables. Severe errors that affect the health of the Whole Sky Imager require immediate attention. These errors are called red flag errors. Red flag messages are listed first. A brief diagnostic message is displayed with each error. The WSI operations manual should be consulted for more detail. Errors that may affect WSI data and that require eventual user attention are called yellow flag errors. These errors are shown second. The next table displayed is an image grab history table. This table can be used to help pinpoint the time any errors may have occurred. For further diagnostic information the user can also display the header information saved for each image. The header is a line of data embedded into each WSI image. The header contains information such as time of grab, occultor and filter settings. For more information on RunWSI headers, refer to the RunWSI program description document. How do I decode the error numbers shown in the WSI status table? When the user requests status information, all errors encountered are displayed with a brief diagnostic description. The image grab history table lists only the most severe error. In order to maximize the amount of information displayed in the table, a code is used to indicate the type of error. Table 2 shows the WSI error decoder list. The Run WSI program has started but there are no tapes in the Exabyte drives. This can happen when the WSI is first installed or if a user simply forgets to replace tapes during a tape change operation. The Run WSI program is intended to run automatically with little user interaction, therefore there is no mechanism built into the program to wait until tapes are inserted into the 8mm tape drives. RunWSI will continue with data acquisition but write data to the hard disk instead of to tape. This can quickly fill up available hard disk space. To close the RunWSI session and then insert tapes into each empty tape drive: 1) Access the OS/2 Window List by pressing the CTRL and ESC keys simultaneously. A window showing all open sessions is displayed. 2) Point to the RunWSI title in the Window List using the mouse. 3) Double click the first mouse button. Click the YES box in the confirmation window to close the RunWSI session. 4) Insert new tapes into each Exabyte drive. Restart RunWSI by double clicking on the RunWSI icon on the OS/2 desktop. B-5 Table 1 RunWSI HotKey Options The HotKey feature allows the user to interact with the Whole Sky Imager computer system to 1) vary Whole Sky Imager operating parameters 2) check the performance history of the WSI, 3) review recently acquired imagery, and 4) perform maintenance procedures. The incorrect use of hotkeys can adversely affect data acquisition, please follow the guidelines listed below. Hotkey options can be accessed by pressing the appropriate key. Description Track Overlay - If you have a pre-established track file, you can view the track overlay by using this option. This is a toggle switch so that you may turn on/off this option by pressing the key twice. Use of this option can slow down the display of acquired images. Geometric Grid Overlay - Use this option to see the displayed image divided into sectors. A green overlay indicating N, S, E and W is displayed over the acquired image. Use of this option can slow down the display of acquired images. Autoscale display option - WSI images are 16 bit images. The normal display range is 0 -65535. With this range it may be difficult to see any details in the image. The Autoscale function automatically displays the image such that there is more contrast. This option should be left on. Enable/Disable Cloud decision processing Enable/Disable Exabyte archival. This option is normally enabled. Help Key - A list of hotkey options is displayed for approximately 3 seconds. Change Acquisition Interval - The default acquisition interval is set in the Run WSI.INP file. The normal acquisition interval is 10 minutes. Valid acquisition interval range is 2 - 60 minutes. An acquisition interval of less than 10 minutes will require that the Exabyte tapes be exchanged more frequently. A 2 minute acquisition interval requires that Exabyte tapes be replaced every 2 days. A 10 minute acquisition interval requires a tape change every 7 days. Image Review menu - The last four image sets grabbed are available for the user to review. The images can be rescaled to view specific features. The images can then be saved to hard disk for future reference. Data acquisition is delayed if the user spends too much time in the image manipulation menu.. Compute Ratio - A ratio image can be computed within RunWSI. The four most current ratio images are stored on hard disk. These images can be reviewed by using the 'M' hotkey. The ratio images are also archived with the raw data, on 8mm tape. Change Exabyte tapes - Use this option on scheduled tape change days. The data period contained on each tape used is displayed when the tapes are ejected. A reminder to clean the Exabyte tape drives is posted. Exit RunWSI - For all data and diagnostic files to be saved properly, use the 'X' key to terminate the RunWSI program. * These keys act as toggle switches. Each key press either activates or deactivates the option. A message indicating the status of the option is displayed after each key press. B-6 Table 2 RunWSI Status Table Error Codes When a status check request is made, RunWSI first lists a brief diagnostic message for all errors that have occurred. At the end of the error listing the user can choose to look at the image grab history. Flashing red and yellow flag codes appear in the right hand column of the image grab history table. Only the most severe error is shown in this table. The following list gives a brief description of each error code. The codes are listed from the most to the least severe error. Refer to the WSI Operations Manual for more detail on WSI errors. Red Flag Errors 0 Code Description Camera CCD chip temperature above 0°C Environmental housing temperature above 49°C Coolant flow rate less than .09 gallons per minute Camera housing temperature above 49°C No response from camera. Images are not being snapped. Arc occultor not responding to commands in > 90% of images grabbed Trolley occultor not responding to commands in > 90% of images grabbed Arc occultor is responding but is unable to get to programmed destination in > 90% of images grabbed Trolley occultor is responding but is unable to get to programmed destination in >90% of images grabbed Neutral density filter operation error in > 90% of images grabbed Spectral filter operation error in > 90% of images grabbed Nitrogen pressure reading error All available tape drives have failed or all available tapes are full 11 12 13 Yellow Flag Errors Code Description Camera CCD chip temperature above -30°C Environmental housing temperature above 32°C Coolant flow rate less than .125 gallons per minute Camera housing temperature above 32°C Arc occultor not responding to commands in > 10% of images grabbed Trolley occultor not responding to commands in > 10% of images grabbed Arc occultor is responding but is unable to get to programmed destination in > 10% of images grabbed Trolley occultor is responding but is unable to get to programmed destination in > 10% of images grabbed Neutral density filter operation error in > 10% of images grabbed Spectral filter operation error in > 10% of images grabbed Writing to last available Exabyte drive Hard disk is full Nitrogen pressure is less than 2 PSI WWV clock not responding 9 10 11 12 14 B-7 Change Exabyte tapes?: (1 = yes, 0 = no): Wait... writing last EOF to drive 1 Wait... unloading tape in drive 1 Label tape in drive 1: Start date: 3/16/95, End date: 3/23/95 Check Exabyte status lights. If the top and bottom LEDs are flashing on an Exabyte drive, please insert an Exabyte cleaning tape into that drive. Also, if it has been two weeks since an Exabyte drive has been cleaned, please clean it. Each Exabyte should have its own ng tape. After cleaning a drive, label the cleaning tape with the current date. Press the ENTER key when you have finished the cleaning process. Insert new tapes into each empty tape drive. Press the ENTER key after the tapes are loaded and the bottom green LED on each Exabyte drive has stopped flashing. . Figure 1 Option 'T' - Change Exabyte Tapes B-8 Table 3 RUNWSI. INP - Input file for RUNWSI.EXE Location Information Latitude --- Longitude -- Site Identifier Hardware vers Software vers. -- 32.70 -- 117.24 MPL 3.2 - 4.0 Instrument Factors | O Gear Cor (azi) --- Gear Cor (zen) --- Camera Azimuth Offs Field Azimuth Offset Image Azimuth Offset - C C OOOOO Acquisition Options ا 1 ا 1 Acquisition interval in minutes -- Perform Ratio? - Red/Blue grab? --- Exabyte Archive? -- Allow hotkey access? Starting Exabyte drive (1 Maximum Exabyte number (1-3) -- ا 1 WHHMOON 1 ا لا لا Display Options Autoscale displayed images Display target track? Display geometric overlay? OOH Image Geometric Information 1 Center x --- Center Y --- 90 Degree Radius I -- 252 256 238 Red/Blue Calibration Factors ND1 ND2 ND3 - 4837. 5430. 4468. Camera Housing Temperature (°C) Normal temperature -- Yellow flag level Red flag level ----- - 16 > 32 V 49 B-9 cont. RUNWSI. INP - Input file for RUNWSI.EXE CCD chip Temperature (°C) Normal temperature -- Yellow flag level -- Red flag level ---- ---- -35 --- > -30 ---- > 0 Environmental Housing Temperature (°C) Normal temperature - Yellow flag level --- Red flag level ---- --- > 32 > 49 Flow rate (gallons per minute, gpm) Normal flow rate --- Yellow flag level Red flag level -- IV v .25 < . 125 .09 - - - - - Nitrogen Pressure (pounds per square inch, psi) Normal level ---- Yellow flag level Red flag level --- < 2 = 999 Relative Humidity (8) Normal level --- -- 20 Yellow flag level · > 50 Red flag level --- ----Uw stag level --------------- --- > 80 DropShipper parameters (Max. 15 chars. End with backslash) Dropshipper send directory Send files to Dropshipper? --- d: \send_dirl Maximum Display Ratios ND1 Maximum Display Ratio -- ND2 Maximum Display Ratio ND3 Maximum Display Ratio - 65535 30000 30000 و لا لا Opaque Thresholds ND1 Opaque Threshold -- ND2 Opaque Threshold - ND3 Opaque Threshold -- 120 130 130 Default Reference Value ----- ----- 80 B-10 RUNWSI. INP - Input file for RUNWSI.EXE cont. f 5 Thin Cloud Acceptance Level (%) ----- 15 Indeterminate Window (%) ----- Time Offset --- 0 Create diagnostic log (runwsi.dgn)? - 0 TWP Specific Options 1 1 Time source O=BIOS, 1=WWV, 2=GPS --- Perform Cloud Decision? ------- Display O=Red, 1=Rat+cid, 2=Rat, 3=cid - 1 EXB drive for processed data ----- Horo B-11 Fig 2 Shutting Down Your System You can preserve your desktop and the integrity of the operating system by doing a shut down on your system before turning it off. The shut-down process stores information about which windows are open, their placement on the desktop, and with some programs even their current state, in addition to writing the information that is in the cache (storage buffer) to the hard disk. Note: Be sure to check all programs for unsaved information (such as documents you are editing) before you start the shut-down procedure. 1. Open o Refresh now Help Create shadow.. Lockup now Shut down. To shut down your system using a mouse: 1. Point to an empty area on the desktop. 2. Click mouse button 2. 3. Select Shut down. 4. Select Yes. 5. Wait for a message that states that the shut down is complete. 6. Turn off the computer. ...... .... .:- - :...... . het ook ros System setup * * Arrange. Open to Refresh now Help-2010 Create shadow.. Lockup now Shut down. system setup Einde To shut down your system using the keyboard: 1. Press Alt+Shift+Tab. (If you are in a full-screen session, press Alt+Esc before you press Alt+Shift+Tab.) 2. Press Ctrl+\ to deselect the icons on the desktop. 3. Press Shift+F10 to display the pop-up menu for the desktop. 4. Use an arrow key to highlight Shut down. 5. Press Enter. 6. Press Enter again to select Yes. 7. Wait for a message that states that the shut down is complete. 8. Turn off the computer. . niigi Arranged COS12 Full Screens Chapter 1. Using the Workplace Shell 41 Appendix C MARINE PHYSICAL LABORATORY, 0701 of the Scripps Institution of Oceanography San Diego, California 92152-6400 - .. ... ... ... - ... ---- AV95-029t 6 Dec 95 Technical Memorandum To: Atmospheric Optics Group From: Rich Weymouth & Janet Shields Subject: Occultor Accessory Control Panel Calibration This memo describes the current occultor calibration procedures. This assumes that no prior mechanical alignment of the occultor has been made. This procedure will take one through alignment of the motor position potentiometers within the motor drive assemblies on the occultor and the adjustment of the zero offset, gain and limit potentiometers located on the motor drive PCBs (printed circuit board) in the ACP (Accessory Control Panel). Calibration requires the measurement of voltages located at two different test points on the motor drive PCBs in the ACP. These test points are described within the procedure as TP1 and TP2 and are located as shown in Figure 1. TP2 is the lead of resister R17 that is closest to the edge of the motor drive PCB. Equipment needed for calibration are: voltmeter, clip leads to connect to test points and a small screwdriver to adjust potentiometers. 1. Arc Calibration This calibration is normally done at MPL as part of the assembly of the instrument Note: All voltages measured in the following procedure are referenced to GND on the Arc motor drive PCB. TP1 and TP2 refers to the respective tests points on the Arc motor drive PCB. Please refer to Figure 1 for locations of test points and potentiometers. Put ACP into local mode by turning Local Enable switch to On and switching both the Arc and Trolley Local/Computer switches to Local. Refer to Figure 2. Turn lower limit potentiometer, R25, of the Arc Motor Drive PCB completely counter-clockwise. Turn upper limit potentiometer, R22, of the Arc Motor Drive PCB completely clockwise. Remove cover from Arc drive assembly. The Arc drive assembly is a long rectangular black canister with a rubber grommet around the edge. It should be held on by six 10-32 pan-head Phillips screws. Refer to Figure 3. Loosen the two set screws on the coupling connecting the Arc position potentiometer to the motor drive assembly. This potentiometer is found within the Arc drive assembly.(Photos 1 & 2) Move trolley to within 5 inches of the center (top) of the Arc by using either the forward or reverse motor drive switches. This is to prevent the trolley from hitting the WSI sun shield while moving the Arc. C-2 lowe Move the Arc reverse, driving the arc toward the horizon, until upper rail is horizontal. (When the trolley drive is to the north, and arc drive south, this should place the arc to the east.) Use a level to verify it is horizontal. Adjust the shaft of the Arc position potentiometer until the voltage at TP2 is 0.05 +0.01 VDC. Tighten the set screws on the Arc position potentiometer. Adjust offset potentiometer, R18, until the voltage at TP1 is 0.00 0.01 VDC. 11. Move the Arc forward (a full 180°) until upper rail is horizontal (this was the lower rail when in full reverse position). Use a level to verify it is horizontal, 12. Adjust gain potentiometer, R16, until the voltage at TP1 is -9.00 0.01 VDC. 13. Repeat steps 7 and 10 followed by steps 11 and 12 as necessary until they require no further adjustment. At the end of step 13, the arc should be in the 180° position with the voltage at TP1 -9.00 + 0.01 VDC. Top rail should be horizontal and may be verified with a level. Adjust the Arc Position (DEG) panel meter until it displays 180.0. Note: its adjustment is located through the opening on the rear of the panel meter. Move the Arc reverse until the front panel position readout displays 176.5°. Adjust upper limit potentiometer, R22, counter-clockwise until the forward limit LED turns on. 16. Move the Arc reverse until the front panel position readout displays 3.5º. Adjust lower limit potentiometer, R25, clockwise until reverse limit LED turns on. 17. Replace the cover of the arc drive assembly. 2. Trolley Calibration Note: All voltages measured in the following procedure are referenced to GND on the Trolley motor drive PCB. TPI and TP2 refers to the respective tests points on the Trolley motor drive PCB. Please refer to Figure 1 for locations of test points and potentiometers. Verify that the ACP is in local mode. The Local Enable switch should be On and both the Arc and Trolley Local/Computer switches should be on Local. Refer to Figure 2. Move the Arc to its vertical position (90°) by using either the forward or reverse motor drive switches. Move the Trolley reverse until it is aligned with the 30° idler support on the Arc. Refer to Figure 3. Turn lower limit potentiometer, R25, of the Trolley motor drive PCB completely counter-clockwise. Turn upper limit potentiometer, R22, of the Trolley motor drive PCB completely clockwise. Turn the zero offset potentiometer, R18, of the Trolley motor Drive PCB completely clockwise. 7. Remove lead block beneath trolley motor drive assembly (Four 10-32 screws). Remove cover from Trolley 'motor drive assembly. The Trolley motor drive assembly is a black cylinder located opposite the Arc drive assembly on the occultor. (See Fig. 3). It should be removed as follows. Using a 3/32-inch, long-handled allen wrench, remove the eight 4-40 socket head screws from the drive motor plate by inserting the wrench through the bearing plate access holes. Similarly remove the eight 4-40 socket head screws from the drive body. (See Photos 3 & 4). Slide the drive body in the direction of the connector until the motor and potentiometer are exposed. (See Photos 5 & 6). Be careful not to strain the internal wiring. Using a 3/64-inch allen wrench, loosen the three potentiometer coupler set screws two turns each. (See Photo 7). The potentiometer and potentiometer coupler should now be free to rotate with respect to the gearhead. Rotating the potentiometer should change the Accessory Control Panel trolley digital display. 10. Slide the potentiometer and coupler away from the gearhead exposing the potentiometer spur gear. (See Photo 8). 11. Rotate the Trolley position potentiometer (by rotating the spur gear) until the voltage at TP2 is 2.25 +0.01 VDC. Remove one of the three coupler set screws and very carefully reinsert the potentiometer and coupler into the gearhead. Patience is required to align the fine- tooth spur gear. Use the removed set screw hole as a view port to verify that the gearhead exterior groove is aligned with the set screw points. Reinstall the set screw and rotate the potentiometer and coupler to fine tune the trolley voltage at TP2 back to 2.25 +0.01 VDC 13. Replace the desiccant bag in the connector base of the trolley body and carefully slide the trolley body over the motor and potentiometer, verifying the motor plate O-ring has properly seated. Reinstall the sixteen trolley body 4-40 socket head screws. 14. Adjust R18 until voltage at TP1 is -1.50+0.01 VDC. 15. Move the Trolley forward until it is aligned with the 150° idler support on the Arc. 16. Adjust gain potentiometer, R16, until the voltage at TP1 is -7.50 + 0.01 VDC. 17. Move the Trolley reverse until it is aligned with the 30° idler support on the Arc. Readjust R18 so that the voltage at TP1 is -1.50 +0.10 VDC. 18. Repeat steps 15 through 17 until the necessary voltages agree. 19. Move the Trolley forward until the voltage at TP1 is -7.50 + 0.01 VDC. The trolley should be aligned with the 150.0° idler support. Adjust the Trolley Position (DEG) panel meter until is displays 150.0°. Note: its adjustment is locate through the opening on the rear of the panel meter 20. Move the Trolley forward until the front panel position readout displays 165.0°. Adjust upper limit potentiometer, R22, counter-clockwise until forward limit LED turns on. Refer to Figure 1. C-4 21. Move the Trolley reverse until the front panel position readout displays 16.09. Adjust lower limit potentiometer, R25, clockwise until reverse limit LED turns on. Refer to Figure 1. This completes the normal Occultor ACP calibration. C-5 - .- Figure 2 MJIN INOL! 294 xO111350 lorenrem w l werden imune bonne Le nombres О 0 101 » о S. 10.101 10 rc:nion (DIC) oncu (ore) moe:98 se HX1 1!.494 10:09 AY05SI3JY .:30 IST Figure 1 OCCULICR 2CP TCP VIEW PER FANEL E Col 1: : 13. j.lig: -3.31 12::8:: Cii 123] (122) RUUUUUU -N19- RII 1.0 J.: 13 . . lis 2:!- : i). 3. * *:: :*T 3 5:• fi: (R25) (229) X : is -K19- 2000000003 iri nr 93 98 7:13 73173 IVO C-6 $0. 120.0 IS0.0 TRS!:6Y CRTVE ASSINILY -DRIVE ASSEMBLY OCCULTOR ASSENSLY Figure 3 C-7 1256. 56. Photo 1 Photo 2 C-8 BE ; * Models -- > Photo 3 Photo 4 91 Photo 5 Photo 6 C-9 . Photo 7 Photo 8 Appendix D DIRECTIONS for Care, Use and Reactivation $0110 S LIQUIDS CASES 501 10 S40QUOS GASES.SOLIO $ DRIERITE TQUE SONSES:50. การเvascines aivierการณา COMPARTMENT DESICCATORS THE DRIERI TE COMPARTMENT DESICCATOR wili obserb obou! 10 per cent of its weight of wcler vepor and when exhausted moy be reactivated and re-used many scores of limes. Ore len-pound desiccolor will maintain a dry condition in a closed place ooout one hundred cubic feet. Follow directions: 1: Keep desiccator in original wropper until ready !o pioce in use. • 2. Unwrop desiccator and place immediately in any con. venien; position in the compartment. 3. Circulation of the air in a compartment by o ton shortenis drying time, but usually this will not be necessary. 4. Even in very moist air, a desiccator will continue ic absorb woter vapor for one to two weeks. 5. Reoclivolion may be necessary to reduce the original moisture conicnt of materials in the compartment. ó. When exhausted er saturated, the desiccator may be com. piglely reactivated by heating in the baking ovon lorinio or three hours at ordiriary boking temperatures. (460°F to 450°F.) 7. After recclivalicn, allow the desiccator to cool parrinlly and while still warm, return to its place in the compariment for another cycle of drying. 8. Il desiccutor is not needed !or a period of wecks or months, it may be wrapped in ordinary paper and stored. When noeded again, the desiccator should be freshly re. activated. If the desiccator is cored for and used according to these directions, it will serve indefinitely. THE W. A. HAMMOND DRIERITE CCMPANY .... ........... . . . . . . . . P.U. Box us XENIA, ONIO 45JIS 15131 376-377