sheila.dwyer@LIGO.ORG - posted 18:05, Tuesday 17 March 2015 - last comment - 13:43, Wednesday 18 March 2015(17320)
ETMY L1 coil driver off
Dan, SHeila, Jeff K remotely
The coil driver for ETMY L1 shut itself off this afternoon, this might have been while I was trying to measure the L2P coupling there. We switched the rocker switch and things are fine. The symptom was that we didn't seem to be drivig even though everything on the medm screen looked fine, the OSEM readback all had low values. This is the same situation we had at End X a while ago alog 16511
This is one of the "errors" that we probably need better monitorinng of. As a short term solution maybe we could add this to TJ's list, to check if all OSEM readbacks are low for a certain stage.
Just in the case that you weren't aware, that rocker switch is in fact a 3A circuit breaker. So whatever was going on with that stage was taxing that driver pretty hard.
I have already put it in the SYS_DIAG guardian. I had it on Pause during the time that coil driver turned off so I wasn't aware that it had.