NOAA Office of Satellite and Product Operations

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NOAA 18 EPS Subsystem Summary

Component Description Status
ADESolar Array Drive ElectronicsGreen
BAT 1Battery # 1Green
BAT 2Battery # 2Green
BAT 3Battery # 3Green
BRU 1Battery Reconditioning Unit 1Green
BRU 2Battery Reconditioning Unit 2Green
BRU 3Battery Reconditioning Unit 3Green
PSEPower Supply ElectronicsGreen
SASolar ArrayGreen
SA SADPOSGreen
SADSolar Array DriveGreen
SATCUSolar Array Telemetry Commutator UnitGreen
SHUNT ASolar Array Shunt Drive AGreen
SHUNT BSolar Array Shunt Drive BGreen


Subsystem History:

Date Time Component Description
09/28/201615:49:23SASolar Array offset to 0 deg.
06/20/201615:03:39SASolar Array offset to -30 deg.
09/30/201515:32:51 Re-enables SADPOS as a backup to SADCS.
09/29/201515:48:20SASolar Array offset to 0 deg.
09/24/201513:21:52SASolar Array offset to -30 deg.
09/15/201521:32:41 SADPOS function disable
06/23/201514:24:57 All battery charging to medium rate.
06/23/201514:24:57BAT 1All battery charging to medium rate.
06/23/201514:24:57BAT 2All battery charging to medium rate.
06/23/201514:24:57BAT 3All battery charging to medium rate.
04/28/2015SATransitioned from full sun to eclipse season.
03/20/201510:53:55 Clear the Sun Lost Flag.
03/20/201510:44:23SATotal Solar Eclipse ended.
03/20/201507:35:49SATotal Solar Eclipse started.
02/18/201516:31:26 Connect shunt drive 2 to PSA-A in primary mode controller.
01/26/201517:31:21PSECommand PSE boost voltage regulator phase control back to primary.
01/22/201508:51:24PSEBVR Phase Controller switched to back-up.
10/23/201423:51:39SAPartial Solar Eclipse ended.
10/23/201419:37:33SAPartial Solar Eclipse started.
09/09/2014SATransitioned from eclipse season to full sun.
11/03/201314:56:13 Clear the Sun Lost Flag.
01/22/201319:03:41PSECommand PSE boost voltage regulator phase control back to primary.
01/21/201316:32:00PSEPSE Phase Controller Switched to Back-up, similar to the March 8, 2011 incident.
03/09/201119:00:00PSEPSE boost phase control commanded back to primary
03/08/201121:55:43PSEPSE Phase Controller Switched to Back-up, similar to the January 4, 2007 incident.
07/22/200905:45:34PSECleared PMS Status Word and Sun Lost Flags that were set as a result of the Total Solar Eclipse.
08/01/200812:30:00SARE-Enable SADPOS as backup to SADCS.
08/01/200807:30:00SADisable SADPOS software. Make SADCS in control lock out SADPOS backup.
02/07/200812:48:00SA SADPOSDisable SADPOS software. Make SADCS in control lock out SADPOS backup.
02/07/200806:16:00SA SADPOSRE-Enable SADPOS as backup to SADCS.
01/10/200716:48:40PSEPSE boost phase control commanded back to primary
01/04/200709:32:24PSEPSE Phase Controller Switched to Back-up, similar to the March 29, 2006 incident.
09/22/200613:11:00 Sun-moon eclipse event occurred on 1 orbit between 13:11z and 13:38z. Deepest percentage of solar array occlusion was approx. 69%.
09/01/200617:40:00 TIP dwell back to 1 sec bus voltage
09/01/200612:40:00BAT 2TIP dwell on NBAT2AT ch 42
09/01/200612:39:00 TIP dwell back to 1 sec bus voltage
08/31/200621:12:00BAT 1TIP dwell on NBAT1AT ch 26
08/31/200621:11:00 TIP dwell back to 1 sec bus voltage
08/31/200616:10:00 TIP dwell back to 1 sec bus voltage
03/30/200614:00:00PSECommand PSE boost voltage regulator phase control back to primary.
03/29/200605:02:31PSEPSE Phase Controller Switched to Backup, cause unknown. Under investigation. Redundancy lost.
03/28/200610:20:00 Sun-moon eclipse event occurred on 1 orbit between 10:23z and 10:28z. Deepest percentage of solar array occlusion was approx. 19%.
10/03/200508:59:00SASolar eclipse occurred on 3 successive orbits the first 08:57 - 09:01z the second from 10:45-10:51z and the third and deepest between 11:46 through 11:58z. Maximum percent loss of array current was 62% down to 70 mAmps. SADPOS timer ran and batteries discharged from 11:49 through 11:54z. This was the first ever solar eclipse on N18. No reconfigurations required to prepare for this event.
09/22/200516:37:00SATCUSATCU back to mode B (normal configuration).
09/22/200515:52:00SASATCU mode A, STX 4 on and configured, analog dwell on boom angle, EXECUTE 360 DEGREE FORWARD SOLAR ARRAY SLEW while in darkness using pre-loaded macro.
09/21/200516:50:00SATCUSATCU mode back to B (normal ops configuration)
09/21/200516:00:05SASATCU mode A, STX 4 on and configured, analog dwell on boom angle. PERFORM 360 DEGREE SOLAR ARRAY SLEW WHILE IN DARKNESS using pre-loaded macro.
07/29/200515:05:00ADESelect solar array drive electronics side #1. Switch to side #2 did NOT improve pitch oscillation situation.
07/27/200513:50:00ADESelect Solar Array Drive Electronics side #2. Switch to determine if N18 excess Pptch noise is caused by a broken pole in Side 1's motor windings.
07/05/200518:56:00SATCUSelect SATCU B
07/05/200517:21:00SATCUSelect SATCU A
06/06/200514:06:00SASolar array offset changed to -40 degrees (from -35)
06/06/200514:05:30BAT 3Battery-3 set to LOW charge rate.
06/06/200514:05:15BAT 2Battery-2 set to LOW charge rate.
06/06/200514:05:00BAT 1Battery-1 set to LOW charge rate.
05/30/200516:50:00 Power survival safe state monitoring enabled used to autonomously turnoff spacecraft loads in the event of batter voltages of less than 19 volts or charge state of less than 26 AmpH.
05/26/200512:30:00SASolar array offset moved to -35 degrees (from -45)
05/25/200512:42:00BAT 3Battery 3 V/T changed to 4/7
05/25/200512:41:00BAT 2Battery 2 V/T changed to 4/7
05/25/200512:40:00BAT 1Battery 1 V/T changed to 4/7
05/24/200516:20:00SASolar array offset moved to -45 degrees (from 0 degree).
05/24/200512:50:00SASADPOS test. Enabled autonomous control of solar array by SADPOS which autonomously moved array to 0 degree offset (from +10). Sucessful test.
05/23/200517:50:00SASolar array offset moved to +10 degrees (from 0) for testing purposes.
05/23/200514:45:00SASolar array offset moved to 0 degrees (from -45) for testing purposes.
05/21/200513:25:00SASolar array offset moved to -45 degrees (from -55)
05/20/200521:45:00SASolar array offset moved to -55 degrees (from -30)
05/20/200513:31:00SASolar array offset moved to -30 degrees (from 0 degs)
05/20/200511:50:00ADEon orbit
05/20/200511:50:00BAT 1on orbit
05/20/200511:50:00BAT 2on orbit
05/20/200511:50:00BAT 3on orbit
05/20/200511:50:00BRU 1on orbit
05/20/200511:50:00BRU 2on orbit
05/20/200511:50:00BRU 3on orbit
05/20/200511:50:00PSEon orbit
05/20/200511:50:00SADon orbit
05/20/200511:50:00SATCUon orbit
05/20/200511:50:00SHUNT Aon orbit
05/20/200511:50:00SHUNT Bon orbit
05/20/200511:45:00 on orbit
05/20/200511:43:00SASolar array nominal deployment. CANT Angle=22 degrees