david.barker@LIGO.ORG - posted 08:53, Wednesday 24 December 2014 - last comment - 12:08, Wednesday 24 December 2014(15826)
LHO power problem Tuesday Evening 19:57 PST
The LHO GC UPS reports going onto battery power from 19:56:21 to 19:56:26 PST Tuesday 23rd December 2014. This is the time Jeff reports the PSL developed problems.
Looking at the CDS overview this morning (attached) several systems are reporting problems. I press the DIAG_RESET button on all models and got the second MEDM screen attached.
Looks like we are having DAC errors on LSC and ISCEY. We will most probably have to restart all the models on these front ends to clear. If any commissioners are on site today, could you call my cell phone and we can walk through this.
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At approximately 7:56 last night the Substation in the 400 area that feeds LHO had an event. The protective relay saw a fault on the BPA line that feeds it and tripped off. The reclosure closed immediately and the power was restored within 1 cycle. Only the most sensitive systems would have seen this. DOE is not aware of what caused the relay to trip as everything restored without incident.