APACHE POINT OBSERVATORY SDSS 2.5M OBSERVING LOG Sunday September 21, 2003 (MJD 52904) ---=== OBSERVING TEAM ===--- Jurek Krzesinski Dan Long Mike Harvanek (swing) + Steve Bastian and Jon Brinkman who were trying to get the telescope working tonight. ---=== OBSERVING PLAN ===--- Science! ---=== OBSERVING SUMMARY ===--- A problem with wind baffle motor 3. See the main log or the problems section. Night lost due to that problem. ---=== OBSERVING LOG ===--- Afternoon checkout: ------------------- There was an alt slip on both alt1 and alt2 when moving the telescope to zenith this afternoon (0020Z). Both drive surfaces looked clean and the telescope was in balance so the nature of the slip is unknown. After moving the telescope in az to check fiducials, it was noticed that one of the wind baffle motors did not stop after the telescope had arrived at its destination. Investigation showed that the motor above racks 1 and 2 (power supply and communications) was still spinning. Jon Brinkmann was called and further investigation showed that the problem was actually motor 3 (the one by the louvers). It was running only intermittently and the other two motors were trying to compensate for it. This problem also caused the telescope to hit the wind baffle on several occasions and caused at least one az slip (az1 and/or az2 at 0030Z). Jon notified French and it was decided to have Jon come in and replace the amplifier for wind baffle motor 3. Night ----- So, Jon replaced the amplifier and - the problem didn't go away. We asked French if we coud operate on two motors only and the answer was yes. Steve come up here just on time to remove the one. We tried to move the telescope afterwards, but the driving wheel 3 didn't move at all. We are not sure what is happening here, is this a gear ratio problem, so the friction inside the gear is to high that other two motors canot move it? Anyway we replaced the old motor with a spare one and still coudn't move the telescope. Jon and Dan think that it might be that amplifier 3 is told to hold the drive wheel in place. While I was writing the log, Steve, Dan and Jon removed the motor again, but this time it was still wired up and tried to see if the motor itself is running when the telescope is moved - no it didn't. Meanwhile Steve looked up the gear reducer drawings and it looked possible that he actualy might be able to remove it allowing the drive wheel 3 to rotate freely. After getting the cover off, it became apparent that removing the reducer would not be a simple task. The drawings not giving a clear indication of how it was assembled it was decided not to attempt removing it. 06:39Z We called the night. The problem will be solved by the day crew. Telescope closed, hoses hooked up. 09:45Z EndNight finished very quickly. ---=== IMAGING RUN SUMMARY ===--- Run Time Stripe Lambda Last Flavor Comments Start End Begin End Frame ------------------------------------------------------------------------- 4122 23:23Z 23:39Z 100 O 60.37 64.44 41 ignore nothing done tonight ---=== IMAGING RUN DETAILS ===--- ---=== SKIPPY RESULTS ===--- Run Frame nFrames stars muErr muRms nuErr nuRms rot az el --------------------------------------------------------------------------- ---=== LTMATCH RESULTS ===--- Run Field nFields alt az nGood rowMean rowSig colMean colSig rot ------------------------------------------------------------------------ ---=== SPECTROSCOPY DATA SUMMARY ===--- Summary Checked (y/n): nothing done tonight QA Procedures Done (y/n): UT Exp Time flavor comment (S/N)^2 totals ========================================== b1 r1 b2 r2 ----- sequence 22401, plate -9999 ------- 23:19 22401 0.0 bias ----- sequence 22402, plate 1472 ------- 23:26 22402 10.0 flat 23:30 22403 2.1 arc 23:33 22404 2.1 arc ----- sequence 22405, plate -9999 ------- 00:23 22405 0.0 bias ---=== TELESCOPE OFFSETS AND SCALE I ===--- Time Instrument Az Alt Rot Scale pos offset pos offset pos offset ------------------------------------------------------------------------------ ---=== TELESCOPE OFFSETS AND SCALE II ===--- ---=== DATA TAPE SUMMARY ===--- Goes: JL none Stays: JL none ---=== FOCUS LOG ===--- setmir piston Temp Wind Time Inst scale M1 M2 Foc Az Alt (C) MPH Dir filt fwhm ------------------------------------------------------------------------------ ---=== WEATHER LOG ===--- Wind Time Temp F Dewp F MPH Direction Dust DIMM Sky 23:00Z 64 26 9 287 (WNW) 378 - 23:33Z 63 25 7 286 (WNW) 393 - 00:04Z 63 25 9 291 (WNW) 400 - 00:36Z 62 25 10 266 (W) 403 - 01:08Z 58 24 5 269 (W) 492 - clear 01:40Z 58 23 5 265 (W) 522 - " 03:49Z 57 24 6 276 (W) 579 - 06:26Z 54 37 2 118 (ESE) 535 - 07:29Z 56 34 2 250 (WSW) 523 - 08:33Z 53 35 5 270 (W) 510 - 09:05Z 54 36 1 257 (WSW) 538 - 09:38Z 54 38 1 257 (WSW) 538 - ---=== TELESCOPE STATUS ===--- 01:25Z Enclosure doors opened, fans and blowers on, louvers opened. No interlocks bypassed. ---=== SOFTWARE USED ===--- IOP/SOP: v3_119_0 Watcher: v2_24_0 MCP: v5_20_0 TPM: tpm_v2_32_0 AstroDa: v14_47 TCC: 2.7.1 sdssProcedures: v1_74 tccMon: v2_2 SoS: v4_9_13 hoggPT: v1_6_9 plate-mapper: v4_3_1 ---=== MIRROR NUMBERS ===--- PRIMARY: -------- Scale: 1.000000 MIGS TONIGHT NOMINAL Axial A 0.5460 0.5460 Axial B 0.6320 0.6290 Axial C 1.0910 1.0900 Trans D -8.5750 -8.5750 Lateral E 10.8839 10.9093 Lateral F 10.8585 10.8712 GALILS Commanded: 4600. -2850. 850. -7250. 19000. 18450. Actual: 4600. -2866. 866. -7275. 19011. 18425. SETMIR VALUES PriDesOrient: 0.00 0.00 15.20 829.90 1.60 PriOrient: 0.00 0.00 14.91 830.49 3.19 SECONDARY: ---------- Focus: 0.00 Air Temp.: 18.4 Alt.: 29.999514 MIGS TONIGHT NOMINAL Axial A 1.5100 1.5100 Axial B 1.1010 1.0990 Axial C 1.1140 1.1160 Trans D -0.8260 -0.8210 GALILS Commanded: 1628694. 1548103. 1574452. -3900. -8750. Actual: 1628641. 1548187. 1574504. -3899. -8726. SETMIR VALUES SecDesOrient: 1257.00 0.00 -25.00 0.00 146.27 SecOrient: 1256.98 0.00 -25.04 0.24 146.56 ---=== PROBLEMS IN DETAIL ===--- Alt slip: --------- There was an alt slip on both alt1 and alt2 when moving the telescope to zenith this afternoon (0020Z). Both drive surfaces looked clean and the telescope was in balance so the nature of the slip is unknown. Wind baffle motor 3: -------------------- After moving the telescope in az to check fiducials, it was noticed that one of the wind baffle motors did not stop after the telescope had arrived at its destination. Investigation showed that the motor above racks 1 and 2 (power supply and communications) was still spinning. Jon Brinkmann was called and further investigation showed that the problem was actually motor 3 (the one by the louvers). It was running only intermittently and the other two motors were trying to compensate for it. This problem also caused the telescope to hit the wind baffle on several occasions and caused at least one az slip (az1 and/or az2 at 0030Z). Jon notified French and it was decided to have Jon come in and replace the amplifier for wind baffle motor 3.