david.barker@LIGO.ORG - posted 11:00, Friday 31 October 2025 (87887)
FMCS LVEA/VEA fans off for a few minutes between 05:10 and 05:15 early Thursday morning
Eric, Dave:
Following up on the end station VEA temperature excursions yesterday morning, Eric noticed that the fan accelerometer channels looked strange just prior to that time.
The attached plot shows that most, but not all, of the LVEA/VEA fans were turned off for about 1min40sec each, with the turn off times not coincident, but over a period of several minutes.
| FAN | Turn Off | Turn On | Duration |
| EY | 05:13:10 | 05:14:44 | 1min34 |
| EX | 05:12:32 | 05:14:13 | 1min41 |
| MY | 05:12:24 | 05:14:10 | 1min46 |
| MX | 05:11:41 | 05:13:19 | 1min38 |
| LVEA-FAN1 | 05:12:28 | 05:14:10 | 1min42 |
| LVEA-FAN2 | 05:12:31 | 05:14:12 | 1min40 |
| LVEA-FAN3 | 05:10:57 | 05:12:30 | 1min33 |
LVEA-FAN4 is always zero. FAN5 and FAM6 have a signal but no change around this time.
Images attached to this report
