Reports until 19:29, Thursday 17 May 2018
LHO VE (VE)
gerardo.moreno@LIGO.ORG - posted 19:29, Thursday 17 May 2018 - last comment - 08:39, Friday 18 May 2018(42057)
Turbo pump pumping CP4 tripped off

(Chandra R, Gerardo M)

The turbo pump pumping CP4 tripped off this afternoon, the turbo controller was off and the scroll pump backing the turbo was on, but isolated. 

The following was done to restart the system: The turbo was isolated via its manual valve as a precaution, then the turbo was restarted, it reached full RPMs, after reaching normal running condition the backing pump was valved in.

After 1 hour the system seems to be OK.  Pressure is now at 1.40x10-08 torr.

Something to note, we need a lower alarm setpoint for H0:VAC-MY_Y4_PT245B_PRESS_TORR, by the time I received the first text alarm (00:24 utc while I was at the site) we were at 5x10-05 torr.

It is not understood why the turbo tripped, but we'll look into it.

Comments related to this report
gerardo.moreno@LIGO.ORG - 19:40, Thursday 17 May 2018 (42058)
Link

Screenshot of alarms.

Images attached to this comment
thomas.shaffer@LIGO.ORG - 08:39, Friday 18 May 2018 (42062)
Link

Something to note, your screenshot is of the VerbalAlarms log, which does not necessarily share the same alarm values as the text alarms. This is something that I am working with CDS on and we will see a change sometime in the future.