david.barker@LIGO.ORG - posted 08:59, Monday 09 June 2025 - last comment - 10:48, Monday 09 June 2025(84896)
EY cryopump CP7 below nominal fill level
The PID controller for EY CP7 cryopump has opened its liquid level control valve (LLCV) to 100% but this is proving to be insufficient to maintain a 92% fill level in the pump. The pump level started deviating from nominal around 4pm Friday 06jun2025 PDT.
Vacuum team is investigating.
Note: no alarms issued at this point, the cyropump alarm level is < 80%, CP7 currently is at 85%.
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I had noted the LLCV issue for CP7 here. Tomorrow we'll attempt to re-zero the LLCV actuator.