Reports until 22:05, Tuesday 11 November 2014
H1 CDS
sheila.dwyer@LIGO.ORG - posted 22:05, Tuesday 11 November 2014 - last comment - 09:36, Wednesday 12 November 2014(14995)
power problems in electronics room

Alexa, Evan, Nic, Sheila

We seem to have lost the -24 V rail and the -12 V on several racks in the electronics room.  The PSL/IO/TCS beckhoff chassis power switch was in the off position when we went out there, I tried flipping it to on and the rocker switched off again immediately.  On the cds overview we have lots of red on the PSL frontends, this chassis is in the same rack as the PSL/IO/TCS beckhoff chassis, and they are on the same 24 V supply.  Nic restarted the front end models several times, then restarted the computer, then restarted the computer and restarted the PCIE expansion box.  (before we realized that we were missing power). 

Comments related to this report
richard.mccarthy@LIGO.ORG - 06:22, Wednesday 12 November 2014 (14996)CDS
Link 

There is not problem with the Power in these racks.  The Beckhoff and IO expansion chassis only need +24 so we do not feed them -24Vdc and the 12V in the rack next to the PSL is the timing system which also only needs +12V so no - 12 V available.  The Beckhoff chassis must have an internal problem which took down the PSL.  I will open it up this AM to verify and hopefully fix the problem.
richard.mccarthy@LIGO.ORG - 09:36, Wednesday 12 November 2014 (15001)CDS, IOO, PSL
Link 

The TCS Y rotation stage power board had a problem (investigating now) that caused the 24V supply breaker to trip.  We have replaced this board and the system is back up and running.  

Assuming this fault in the Beckhoff chassis caused a drop on the 24Vdc supply to the Front End IO chassis this caused the PSL front end to have problems.  I have power cycled the IO chassis and restarted the FE computer.  The system should be back and ready to lock.