NOAA Office of Satellite and Product Operations

NOAA 18 EPS Subsystem Summary

Component Description Status
ADE Solar Array Drive Electronics Green
BAT 1 Battery # 1 Green
BAT 2 Battery # 2 Green
BAT 3 Battery # 3 Green
BRU 1 Battery Reconditioning Unit 1 Green
BRU 2 Battery Reconditioning Unit 2 Green
BRU 3 Battery Reconditioning Unit 3 Green
PSE Power Supply Electronics Green
SA Solar Array Green
SAD Solar Array Drive Green
SATCU Solar Array Telemetry Commutator Unit Green
SHUNT A Solar Array Shunt Drive A Green
SHUNT B Solar Array Shunt Drive B Green

Subsystem History:

Date Time Component Description
09/30/2015 15:32:51   Re-enables SADPOS as a backup to SADCS.
09/29/2015 15:48:20 SA Solar Array offset to 0 deg.
09/24/2015 13:21:52 SA Solar Array offset to -30 deg.
09/15/2015 21:32:41   SADPOS function disable
06/23/2015 14:24:57 BAT3 All battery charging to medium rate.
06/23/2015 14:24:57 BAT2 All battery charging to medium rate.
06/23/2015 14:24:57 BAT1 All battery charging to medium rate.
06/23/2015 14:24:57   All battery charging to medium rate.
04/28/2015   SA Transitioned from full sun to eclipse season.
03/20/2015 10:53:55   Clear the Sun Lost Flag.
03/20/2015 10:44:23   Total Solar Eclipse started.
03/20/2015 7:35:49   Total Solar Eclipse ended.
02/18/2015 16:31:26   Connect shunt drive 2 to PSA-A in primary mode controller.
01/26/2015 17:31:21 PSE Command PSE boost voltage regulator phase control back to primary.
01/22/2015 08:51:24 PSE BVR Phase Controller switched to back-up.
10/23/2014 23:51:39 SA Partial Solar Eclipse ended.
10/23/2014 19:37:33 SA Partial Solar Eclipse started.
09/9/2014   SA Transitioned from eclipse season to full sun.
11/3/2013 14:56:13   Clear the Sun Lost Flag.
01/22/2013 19:03:41 PSE Command PSE boost voltage regulator phase control back to primary.
01/21/2013 16:32:00 PSE PSE Phase Controller Switched to Back-up, similar to the March 8, 2011 incident.
03/09/2011 19:00:00 PSE PSE boost phase control commanded back to primary
03/08/2011 21:55:43 PSE PSE Phase Controller Switched to Back-up, similar to the January 4, 2007 incident.
07/22/2009 05:45:34 PSE Cleared PMS Status Word and Sun Lost Flags that were set as a result of the Total Solar Eclipse.
08/01/2008 12:30:00 SA RE-Enable SADPOS as backup to SADCS.
08/01/2008 07:30:00 SA Disable SADPOS software. Make SADCS in control lock out SADPOS backup.
02/07/2008 06:16:00 SA SADPOS RE-Enable SADPOS as backup to SADCS.
02/07/2008 00:48:00 SA SADPOS Disable SADPOS software. Make SADCS in control lock out SADPOS backup.
01/10/2007 16:48:40 PSE PSE boost phase control commanded back to primary
01/04/2007 09:32:24 PSE PSE Phase Controller Switched to Back-up, similar to the March 29, 2006 incident.
09/22/2006 13:11:00   Sun-moon eclipse event occurred on 1 orbit between 13:11z and 13:38z. Deepest percentage of solar array occlusion was approx. 69%.
09/01/2006 17:40:00   TIP dwell back to 1 sec bus voltage
09/01/2006 12:40:00 BAT 2 TIP dwell on NBAT2AT ch 42
09/01/2006 12:39:00   TIP dwell back to 1 sec bus voltage
08/31/2006 21:12:00 BAT 1 TIP dwell on NBAT1AT ch 26
08/31/2006 21:11:00   TIP dwell back to 1 sec bus voltage
08/31/2006 16:10:00   TIP dwell back to 1 sec bus voltage
03/30/2006 14:00:00 PSE Command PSE boost voltage regulator phase control back to primary.
03/29/2006 05:02:31 PSE PSE Phase Controller Switched to Backup, cause unknown. Under investigation. Redundancy lost.
03/28/2006 10:20:00   Sun-moon eclipse event occurred on 1 orbit between 10:23z and 10:28z. Deepest percentage of solar array occlusion was approx. 19%.
10/03/2005 08:59:00 SA Solar 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.
09/22/2005 16:37:00 SATCU SATCU back to mode B (normal configuration).
09/22/2005 15:52:00 SA SATCU 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.
09/21/2005 16:50:00 SATCU SATCU mode back to B (normal ops configuration)
09/21/2005 16:00:05 SA SATCU 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.
07/29/2005 15:05:00 ADE Select solar array drive electronics side #1. Switch to side #2 did NOT improve pitch oscillation situation.
07/27/2005 13:50:00 ADE Select 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.
07/05/2005 18:56:00 SATCU Select SATCU B
07/05/2005 17:21:00 SATCU Select SATCU A
06/06/2005 14:06:00 SA Solar array offset changed to -40 degrees (from -35)
06/06/2005 14:05:30 BAT 3 Battery-3 set to LOW charge rate.
06/06/2005 14:05:15 BAT 2 Battery-2 set to LOW charge rate.
06/06/2005 14:05:00 BAT 1 Battery-1 set to LOW charge rate.
05/30/2005 16:50:00   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.
05/26/2005 12:30:00 SA Solar array offset moved to -35 degrees (from -45)
05/25/2005 12:42:00 BAT 3 Battery 3 V/T changed to 4/7
05/25/2005 12:41:00 BAT 2 Battery 2 V/T changed to 4/7
05/25/2005 12:40:00 BAT 1 Battery 1 V/T changed to 4/7
05/24/2005 16:20:00 SA Solar array offset moved to -45 degrees (from 0 degree).
05/24/2005 12:50:00 SA SADPOS test. Enabled autonomous control of solar array by SADPOS which autonomously moved array to 0 degree offset (from +10). Sucessful test.
05/23/2005 17:50:00 SA Solar array offset moved to +10 degrees (from 0) for testing purposes.
05/23/2005 14:45:00 SA Solar array offset moved to 0 degrees (from -45) for testing purposes.
05/21/2005 13:25:00 SA Solar array offset moved to -45 degrees (from -55)
05/20/2005 21:45:00 SA Solar array offset moved to -55 degrees (from -30)
05/20/2005 13:31:00 SA Solar array offset moved to -30 degrees (from 0 degs)
05/20/2005 11:50:00 BAT 2 on orbit
05/20/2005 11:50:00 ADE on orbit
05/20/2005 11:50:00 SAD on orbit
05/20/2005 11:50:00 BAT 1 on orbit
05/20/2005 11:50:00 BAT 3 on orbit
05/20/2005 11:50:00 BRU 1 on orbit
05/20/2005 11:50:00 BRU 2 on orbit
05/20/2005 11:50:00 PSE on orbit
05/20/2005 11:50:00 SATCU on orbit
05/20/2005 11:50:00 SHUNT A on orbit
05/20/2005 11:50:00 SHUNT B on orbit
05/20/2005 11:50:00 BRU 3 on orbit
05/20/2005 11:45:00   on orbit
05/20/2005 11:43:00 SA Solar array nominal deployment. CANT Angle=22 degrees