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Reports until 10:10, Monday 09 December 2024
H1 SQZ
camilla.compton@LIGO.ORG - posted 10:10, Monday 09 December 2024 (81697)
SAMS servos railed after HV trip. Needed to clear histories.

After the SQZ HV tripped off and was brought back 81689, the PSAMS servos (80685) railed. Attached plot shows the output of SAMS_SERVO at the limit and Strain gauge not at PSAMS target.

To fix this, on the  H1:AWC-ZM{2,4,5}_M2_SAMS_SERVO (small box to the left of REQUESTED PZT(V)),  I increased ramp time form 2 seconds to 5 seconds, ramped gain to 0, cleared history, ramped gain to 1 and then put ramp time back.

After these were back to their nominal, the alignments of the ZMs went back close to nominal and we were able to lock the FC.

Images attached to this report
Displaying report 1-1 of 1.