| Date |
Time |
Component |
Description |
|
| 08/04/2007 | 19:45:00 | SA | Moves array to + 80 degrees (from + 65) |
|
| 08/02/2007 | 20:15:00 | PSE | RESETS PMS STATUS |
|
| 08/02/2007 | 20:15:00 | PSE | MODE CONTROLLER TO PRIMARY |
|
| 08/02/2007 | 20:15:00 | PSE | BOOST REGULATOR TO PRIMARY |
|
| 08/02/2007 | 19:00:00 | SA | Move solar array offset to +65 degrees (from -60).Caused EPS Primary Mode Controller and Boost Regulator switched from Primary to Back-up |
|
| 05/23/2007 | 21:10:00 | SA | Move solar array offset to -60 degrees (from +60). |
|
| 11/28/2006 | 12:00:00 | SHUNT B | Shunt performance degraded resulting in bus voltage surges and reduced regulation of bus voltage. |
|
| 09/22/2006 | 08:25:00 | | Sun-moon eclipse event occurred on 3 OF 4 sequential orbits between 08:25z and 14:15z. Deepest percentage of solar array occlusion was approx. 50%. |
|
| 08/30/2006 | 14:20:00 | SA | Moved solar array offset to +60 degrees (from -60) to prevent sun sensor from being shaded by the solar array while sun angle is below 20 degs because this may cause autonomous switches to YGC attitude control mode. |
|
| 08/14/2006 | 12:00:00 | | Eclipse season ended. Spacecraft again full sunlight orbit. |
|
| 06/28/2006 | 16:55:00 | SA | Move solar array offset to -60 degrees (from +70) to reduce record high battery-1 temps. |
|
| 06/09/2006 | 02:45:00 | SA | Move solar array offset to +70 degrees (from +60) |
|
| 06/08/2006 | 20:25:00 | SAD | Filtered bus voltage exceeded 28.5 so SADBIAS backed of solar array offset with 2, 8 deg steps (starting from 60 deg offset) to 76 deg offset returning back to 60 after next night-day transition. Spacecraft experiencing maximum/saturated shunt loading at this time. Array reconfiguration to reduce power generation under cconsideration. |
|
| 06/06/2006 | 18:00:00 | SAD | Filtered bus voltage exceeded 28.5 so SADBIAS backed of solar array offset with 2, 8 deg steps (starting from 60 deg offset) to 76 deg offset returning back to 60 after next night-day transition. Spacecraft experiencing maximum/saturated shunt loading at this time. |
|
| 06/05/2006 | 13:05:00 | BAT 1 | Battery-1 to VT level-2 |
|
| 06/05/2006 | 13:05:00 | BAT 1 | Battery temps exceeding 10 degs C. Command B1VT2 sent to spacecraft to change battery-1 VT curve from 4 to 2. Transmission was nominal, CV returned was nominal, VT did not change. Suspect anomolous relay or corrupt FSW bit. |
|
| 05/01/2006 | 12:00:00 | | New eclipse season started with the first battery current discharges. |
|
| 04/30/2006 | 20:55:00 | SAD | Disable SABIAS because it is driving the array in the wrong direction when activated. |
|
| 04/30/2006 | 20:55:00 | SAD | Verify SADBIAS is disabled |
|
| 04/30/2006 | 12:00:00 | | Eclipse season onset for 2006. Peaks in late-June at 20% darkness per orbit. |
|
| 04/29/2006 | 18:00:00 | | SADBIAS activated upon high bus voltage but turned array in wrong direction by 5 degs which increased power generation and stress on an already degraded shunt. |
|
| 03/28/2006 | 08:00:00 | | Sun-moon eclipse event occurred on 2 sequential orbits between 08:00z and 12:30z. Deepest percentage of solar array occlusion was approx. 50%. |
|
| 10/03/2005 | 08:46:00 | SA | Solar (sun-moon) eclipse on 3 successive orbits: First and deepest eclipse was between 08:46 and 09:00Z resulting in approx. 50% loss of sun and battery discharges from 08:50 through 08:56z. No reconfigurations required, Spacecraft remained nominal throughout. |
|
| 08/22/2005 | 12:00:00 | | N12 2005 eclipse season end. |
|
| 06/23/2005 | 10:47:00 | SA | Move solar array offset to +60 degrees (from +50). Reduces power generation and shunt stress during daylight portion of orbit. |
|
| 04/21/2005 | 12:00:00 | | Start N12 eclipse season for 2005 |
|
| 04/08/2005 | 19:09:00 | SA | Solar (sun-moon) eclipse on 3 sucessive orbits: 19:09-19:25, 21:29-21:42, 23:16-23:22Z. No reconfigurations required, Spacecraft remained nominal throughout. |
|
| 10/14/2004 | 12:30:00 | SA | Solar (sun-moon) eclipse intermittently for 4 hours between 00:30 and 04:30 No reconfigurations required, Spacecraft remained nominal throughout. |
|
| 08/31/2004 | 15:40:00 | SA | Moves array to +50 degree offset (from -50) while turning on tramsitters to increase load during the move then turnoff transmitters. |
|
| 07/29/2004 | 17:00:00 | | Power subsystem back to nominal and UVTRIP threshold was lowered to 18.7 volts from 19.25. Status upgraded to Green. |
|
| 07/27/2004 | 19:55:00 | SA | Change array offset from -60 to -50 to increase power generation. |
|
| 07/26/2004 | 18:40:00 | BAT 1 and BAT 2 | Reset V/T levels to 4 after on board power safe state program (STESM) set it to level 2. |
|
| 07/25/2004 | 23:18:30 | | Battery-2 undervoltage trip (19.05 volts) placed spacecraft in power safe state mode. Electrical power load shed initiated (62 items). Subsystem declared yellow in status until recovery complete. |
|
| 04/19/2004 | 12:00:00 | SA | Solar eclipse intermittently for 4 hours between 11:00 and 15:00 No reconfigurations required, Spacecraft remained nominal throughout. |
|
| 11/23/2003 | 23:18:00 | SA | Solar eclipse for 19 minutes. 88% was maximum percent shading on solar array. Spacecraft remained nominal. |
|
| 11/23/2003 | 21:21:00 | SA | Solar eclipse for 17 minutes. 75% was maximum percent shading on solar array. Spacecraft remained nominal. |
|
| 08/27/2003 | 12:00:00 | | Eclipse season for 2003 ended. Spacecraft again full sun. |
|
| 07/30/2003 | 13:03:00 | SA | Change the solar array offset to -60 degrees from -45degs for shunt maintenance |
|
| 07/10/2003 | 14:40:00 | SA | Change solar array offset to -45 degrees from -30 degrees. |
|
| 04/22/2003 | | | Eclipse season started on 22 Apr 03 |
|
| 01/29/1998 | | SA | Solar Array was changed from 55 degrees to 30 degrees to reduce shading of sun sensor. |
|
| 05/15/1991 | | SA | Solar Array hinge #7 telemetry readout is intermittent. |
|
| 05/14/1991 | 15:26:00 | BAT 1 | On Orbit |
|
| 05/14/1991 | 15:26:00 | BAT 2 | On Orbit |
|
| 05/14/1991 | 15:26:00 | BRU 1 | On Orbit |
|
| 05/14/1991 | 15:26:00 | BRU 2 | On Orbit |
|
| 05/14/1991 | 15:26:00 | SHUNT A | On Orbit |
|
| 05/14/1991 | 15:26:00 | SHUNT B | On Orbit |
|
| 05/14/1991 | 15:26:00 | SA | On Orbit |
|
| 05/14/1991 | 15:26:00 | SAD | On Orbit |
|
| 05/14/1991 | 15:26:00 | PSE | On Orbit |
|
| 05/14/1991 | 15:26:00 | ADE | On Orbit |
|
| 05/14/1991 | 15:26:00 | SATCU | On Orbit |
