Reports until 09:50, Tuesday 29 August 2017
H1 TCS
thomas.shaffer@LIGO.ORG - posted 09:50, Tuesday 29 August 2017 - last comment - 11:32, Tuesday 29 August 2017(38412)
TCSX Chiller Trip

Jason O., Thomas V., TJ S.

TCSX chiller tripped at Aug 29 2017 11:21:40 UTC (1188040918 GPS). Flow rate only dropped to ~2.55gpm, this should not trip until 2.0gpm. See attached.

This 2.0gpm limit is set analog via some resistors in the controller. The plan, sometime in the future, is to test this controller and make sure that the resistance is what it is suppose to be, and then fix/replace if necessary.

Thomas and I went out to the LVEA to reset the interlock and it came right back. Verbal briefly complained that it had turned off a few minutes after we got back, but it seems that it just lost lock briefly and the power fell low enough that Verbal caught it. Everything seems okay now.

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Comments related to this report
alastair.heptonstall@LIGO.ORG - 11:32, Tuesday 29 August 2017 (38422)

Yes it sounds like the right plan is to pull that controller and test it.  If we can check what voltage/current causes the controller to trip, then we can check that against the flowmeter setting (which should be in current per gallon per minute).