ACE Weekly 09/09/05 - 09/15/05 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: No attitude maneuvers were completed this week. The next attitude maneuver is scheduled for Friday 09/16/05. ============================================================================ OCRs: DOY 255 (09/12/05) 2134-2138z SIS-029 Matrix detector strip #16 on M1B HV disabled due to noise. At the urgent request of the instrument team, an additional support was scheduled on Monday to complete this OCR. DOY 255 (09/12/05) 2138-2139z CRIS-011 The Image Intensifier was powered on after being automatically safeguarded during this week's solar activity (Saturday DOY 253 ~01:07z). This OCR was last executed on 05/19/05. DOY 256 (09/13/05) 1835-1845z ULEIS Shutter Motor Error flag was cleared (see AR#S05-0039). The command to clear the ULSRB_MOT_ERR flag was incorporated into the daily procedure execution when autonomous shutter motion was enabled with OCR ULEIS-061 in September 2001. DOY 257 (09/14/05) 1610-1617z SIS-030 Matrix detector strips #14 and #62 on M1B HV disabled due to noise. SWPX-040 was postponed due to solar activity. The SWEPAM-E CEM High Voltage will be increased from level 14 to level 15 in order to compensate for sensor gain losses due to aging affects. ============================================================================ Ongoing Activities: Space Link Extension (SLE) - The next DSN/Developer test with DTF-21 is tentatively scheduled for Wednesday 10/05/05. ============================================================================ Extra Activities: DOY 257 (09/14/05) - TAPS 4.4 Acceptance testing has been completed and the Test Summary Report has been submitted. TAPS 4.4 will be installed on the Prime TAPS machine on Friday, 09/16/005. DOY 258 (09/15/05) - A 1-hour (2035-2135z) Project Interface Test (PIT) was completed for the equipment upgrade at DSS-27 (V5.9). Even though the ranging calibration is not correct, the ranging subcarrier was applied to test the uplink signal strength and the data was forwarded to FDF to test the interface. Conscan was enabled for this pass and no problems were found. Further post-pass data analysis is underway. ============================================================================ Anomalies: DOY 254 (09/11/05) S05-0038 SWICS Yellow Low Limit Violation SSCGR20V had 2 brief yellow low limit violations (YL <= 17V) during the increased solar activity. Jim Raines notified. 2005-254 04:46:28 - 04:46:52z 17.0-17.0V 2005-254 04:58:16 - 04:58:40z 17.0-17.0V IMPACT: Awaiting instructions from Jim Raines. DOY 253 (09/10/05) S05-0039 S3DPU Red High Limit Violation S3DPU_CONV_SEC_I had 1 brief red high limit violation (RH > 440mA) during the increased solar activity. The SSDIDLECTR was 63. Mark Popecki notified. 2005-253 15:47:58 - 15:47:59z 454-454mA IMPACT: Increased current usage expected during solar activity. DOY 256 (09/13/05) S05-0039 ULEIS Shutter Motor Error flagged ULSRB_MOT_ERR was set to 0xFFFF at 10:16:02z. The flag was cleared during the real-time support (18:39:43z) and the instrumenters were informed. IMPACT: Shutter has successfully moved 2 more times since the motor error flagged. Awaiting instructions from ULEIS team if necessary. Background: Several ULEIS OCRs were executed from May-Nov 2001 to resolve shutter motion problems and enable autonomous shutter motion. The instrument team worked through several issues, for example, adjusting LED/phototransistor settings to correctly measure the motor position. From the instrument team: The purpose of the autonomous shutter motion algorithm is to automatically adjust the position of the ULEIS shutter, based on incoming particle rates, in order to prevent the instrument from saturating during large solar flares. Since 01/01/2002, the shutter has moved 147 times without error. Year # of shutter movements 2002 44 2003 38 2004 34 2005 error on 32nd movement The command to clear the flag was incorporated into the daily procedure execution when autonomous shutter motion was enabled (OCR ULEIS-061) in September 2001. The command must be executed during a real-time support since the parameter location in the on-board data collection buffer contains other ULEIS data which prevents the use of C&DH autonomy bins. DOY 256 (09/13/05) G05-0116 ROBOTT terminated ULEIS procedure The ROBOTT ground software has predefined time constraints on procedure execution. The TSTOL procedure 'uleis_mot_err.prc' was waiting to see that the command to clear the shutter motor error flag was successful when ROBOTT terminated the procedure (18:41:42z). The FOT will resubmit the request to remove ROBOTT's predefined time constraints on procedure execution (CDSID 21270). IMPACT: Procedure was re-executed by ROBOTT. The command to reset the motor position was not sent. The shutter motor, however, had already been at the reset position (100%). DOY 256 (09/13/05) G05-0117 ROBOTT executed 2 procedures simultaneously The ROBOTT ground software started both 'uleis_mot_err.prc' and 's_ops_plbk_complete.prc'. TPOCC paused the ULEIS procedure while executing the SSR procedure. While completing the last SSR redump, ROBOTT terminated all procedures due to predefined time constraints on procedure execution. No procedures were re-executed. The FOT will resubmit the request to remove ROBOTT's predefined time constraints on procedure execution (CDSID 21270). IMPACT: ULEIS shutter motor error had not flagged since it had been cleared earlier. SSR procedure was on the last redump when the procedure was terminated and all data was captured. DOY 257 (09/14/05) G05-0118 GDS DSS-16 Unable to Acquire Downlink. DSS-16 was unable to acquire the downlink at BOT. DSS-24 was brought up to acquire the downlink (telemetry) while DSS-16 provided the uplink (commanding). DSS-24 was only able to provide the downlink due to scheduled maintenance. DR#G106061 IMPACT: Activities delayed 16 minutes. DOY 258 (09/15/05) G05-0119 GDS DSS-16 CMD Mod Index Incorrect CMD Mod Index (0.62dB instead of correct value of 1.69dB) was sufficient for C&DH A to be commanded but not C&DH B. Procedures continued execution, as designed, after C&DH B commands were not accepted so that SSR dumps and state of health checks could be completed. C&DH B needs to be commanded once every 80 hours to avoid antenna reconfiguration. C&DH B was successfully commanded later in the support. DR#G106066 IMPACT: Minimal. Station corrected CMD Mod Index during support DOY 258 (09/15/05) S05-0040 S3DPU Red High Limit Violation S3DPU_CONV_SEC_I had 1 brief red high limit violation (RH > 440mA) during the increased solar activity. The SSDIDLECTR was 39-43. Mark Popecki notified. 2005-258 11:17:33 - 11:18:05z 443-451mA IMPACT: Increased current usage expected during solar activity. DOY 258 (09/15/05) S05-0041 SWICS Yellow Low Limit Violation SSCGR20V had 1 brief yellow low limit violations (YL <= 17V) during the increased solar activity. Jim Raines notified. 2005-258 14:07:04 - 17:07:28z 16.8-17.0V IMPACT: Awaiting instructions from Jim Raines.