peter.king@LIGO.ORG - posted 04:19, Friday 09 September 2016 - last comment - 04:29, Friday 09 September 2016(29558)
laser trip
Came into the Control Room to find that the laser had tripped. It was up and running an hour ago when I checked
it from my office.
Same problem as before. The error bit for the external flow sensors was not set in Beckhoff, so the problem
is not with the ADC terminals. The flow sensors are pretty close to brand new. Conclusion is that it's the
chiller that's glitching, for whatever reason.
In scrolling through the various chiller menus, I did not see any obvious error messages other than the ubiquitous flow sensor 1 error message. However I did make a note that the number of operating hours for the pump (9577) is different than the operating hours reported by the chiller (10490). Not sure why.