oli.patane@LIGO.ORG - posted 20:12, Thursday 02 November 2023 - last comment - 20:34, Thursday 02 November 2023(73943)
Ops EVE Midshift Update
Observing at 157Mpc and have been Locked for 27.5 hours.
At 03:00 we dropped out of Observing for some reason, and when I came back from the kitchen at 03:08 everything looked fine so I put us back into Observing.
It looks like the SQZ_SHG's PZT reached its limit and unlocked. On 11/03 03:00:13, SQZ_SHG logged: 'USERMSG 0: PZT voltage limits exceeded.'
Not sure if it is relevant to this issue, but a couple of hours ago, between 01:32 - 01:36 UTC on 11/03, SQZ_SHG logged 'USERMSG 0: SHG PZT volts low, may be noisy, try relocking' many times.