david.barker@LIGO.ORG - posted 10:57, Wednesday 09 November 2016 (31360)
timeline of Tuesday evening h1oaf0 DAC problem
here is the timeline of yesterday evening's h1oaf0 DAC problem which required a restart of the IOP model
All times are local PST.
Prior to the problem, h1iopoaf0 STATE_WORD is 512 (OVERFLOW)
| delta-T | time | event |
| 0:00 | 19:23:00 | IOP DAC drives go to zero volts. h1iopoaf0 STATE_WORD=652(ADC,DAC,DACKILL,OVERFLOW) |
| +5:00 | 19:28 | phone conversation, decision to restart IOP models |
| +11:00 | 19:33 | models restarted after killing them, DAC drive is restored. Presumably killing model h1susprocpi caused lock loss |