NOAA Office of Satellite and Product Operations

NOAA 15 EPS Subsystem Summary

Component Status:

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
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
03/20/2015 11:14:31   Clear the Sun Lost Flag.
03/20/2015 11:03:31   Total Solar Eclipse ended.
03/20/2015 7:53:49   Total Solar Eclipse started.
02/18/201518:31:58 Connect shunt drive 2 to PSA-A in primary mode controller.
10/23/201423:51:39SAPartial Solar Eclipse ended.
10/23/201419:37:33SAPartial Solar Eclipse started.
11/13/201221:19:24PSECleared Sun Lost Flag that was triggered during Total Solar Eclipse.
09/22/200609:36:00 Sun-moon eclipse event occurred on 2 OF 3 sequential orbits between 09:36z and 13:46z. Deepest percentage of solar array occlusion was approx. 82%.
08/01/200616:00:00 Eclipse season ends for 2006.
05/15/200612:00:00 Eclipse season onset for 2006. Peaks in mid-June at 17% darkness per orbit.
03/28/200608:05:00 Sun-moon eclipse event occurred on 3 sequential orbits between 08:05z and 12:45z. Deepest percentage of solar array occlusion was approx. 83%.
10/03/200508:00:00SASolar-lunar eclipse occurred on 2 orbits first from 07:58:00 through 08:15z resulting in 50% loss of array output and the second (and deeper) from 12:16-12:31z resulting in a maximum 70% loss of array output and 7 minutes of battery discharge. No reconfigurations implemented in preparation for this event.
07/28/200512:00:00 N15 2005 eclipse season end.
05/16/200502:00:00 N15 eclipse season starts. Peaks at 18% darkness per orbit in mid June 05.
04/08/200518:47:00SASolar-lunar eclipse occured on 2 sucessive orbits from 18:47-19:04 and from 22:50-23:04Z. No reconfigurations implemented in preparation for this event. Greatest percentage loss of array current occured at 18:55 down to approx 25 mAmps.
02/26/200500:00:00 Record low sun angle (0 degs) reached. Many new record low component temps as a result. No mission impact.
02/19/200502:30:00SARecord low sun angle (2 degs and going to 0 in lateFeb) has lowered the solar array output so much that some spacecraft components are tripping DARK flags even though spacecraft is full sun. Health remains nominal.
10/14/200400:30:00SASolar eclipse intermittently for 4 hours between 00:30 and 04:30 No reconfigurations required, Spacecraft remained nominal throughout.
07/29/200400:00:00 N15 eclipse season for 2004 ended.
05/11/200400:00:00 N15 eclipse season starts. Peaks at 18% darkness per orbit in mid June 04.
04/19/200412:00:00SASolar eclipse intermittently for 4 hours between 11:00 and 15:00 No reconfigurations required, Spacecraft remained nominal throughout.
12/04/200316:40:00BAT 1Restores day-night history flags to nominal value. Incorrect value was due to eclipse.
11/23/200323:23:00SASolar eclipse for 20 minutes. 90% was maximum percent shading on solar array. Spacecraft remained nominal.
11/23/200321:28:00SASolar eclipse for 15 minutes. 72% was maximum percent shading on solar array. Spacecraft remained nominal.
08/04/200317:00:00 N15 2003 eclipse season ended.
05/03/200316:48:00 Eclipse season for N15 started on 3 May 03 at 16:48Z
10/22/200216:16:00BAT 1Command batteries 1,2 and 3 to low rate charge.
10/22/200216:16:00BAT 2Command batteries 1,2 and 3 to low rate charge.
10/22/200216:16:00BAT 3Command batteries 1,2 and 3 to low rate charge.
08/20/200217:24:00BAT 3command tricle rate charge for batteries 1,2 and 3
08/20/200217:24:00BAT 2command tricle rate charge for batteries 1,2 and 3
08/20/200217:24:00BAT 1command tricle rate charge for batteries 1,2 and 3
08/12/200212:00:00 End eclipse season
04/24/200204:02:00 Start eclipse season
04/22/200217:15:00BAT 1Battery 1 charge rate changed from TRICKLE to LOW in preparation for Eclipse season
04/22/200217:15:00BAT 2Battery 2 charge rate changed from TRICKLE to LOW in preparation for Eclipse season
04/22/200217:15:00BAT 3Battery 3 charge rate changed from TRICKLE to LOW in preparation for Eclipse season
09/06/200118:00:00BAT 1Battery 1 charge rate changed from LOW to TRICKLE
09/06/200118:00:00BAT 2Battery 2 charge rate changed from LOW to TRICKLE
09/06/200118:00:00BAT 3Battery 3 charge rate changed from LOW to TRICKLE
08/22/200100:00:00 End eclipse season
06/21/200100:00:00 Solar eclipse
04/15/200100:00:00 Start eclipse season
04/13/200111:53:00BAT 3Battery 3 charge rate changed from TRICKLE to LOW in preparation for Eclipse season
04/13/200111:53:00BAT 2Battery 2 charge rate changed from TRICKLE to LOW in preparation for Eclipse season
04/13/200111:53:00BAT 1Battery 1 charge rate changed from TRICKLE to LOW in preparation for Eclipse season
01/25/200100:00:00SAsolar array moved from +53 to -45 degrees to cool off hot shunt temps
05/13/199816:26:00ADEOn Orbit
05/13/199816:26:00SATCUOn Orbit
05/13/199816:24:00BAT 1On Orbit
05/13/199816:24:00SADOn Orbit
05/13/199816:24:00SAOn Orbit
05/13/199816:24:00SHUNT BOn Orbit
05/13/199816:24:00SHUNT AOn Orbit
05/13/199816:24:00BRU 3On Orbit
05/13/199816:24:00BRU 2On Orbit
05/13/199816:24:00BRU 1On Orbit
05/13/199816:24:00BAT 3On Orbit
05/13/199816:24:00BAT 2On Orbit
05/13/199816:24:00PSEOn Orbit