jeffrey.kissel@LIGO.ORG - posted 11:58, Thursday 11 May 2023 - last comment - 13:49, Thursday 11 May 2023(69516)
LVEA Temperature Excursion in Output Arm Area Starting at 2023-May-10 13:46 PDT
J. Kissel, E. Capote, T. Shaffer We're struggling through alignment of the SRC during lock acquisition, and we looked through some trends of SR3 alignment and we see that it's alignment is quite off in Yaw. TJ said "Oh, well, yeah, the temperature in the VEA has gone bad. That's normal." Trusting but verifying, I trended the average of zones in the LVEA, and I disagree -- there as a marked step-change in the LVEA temperature starting at 2023-05-10 13:45 PDT (20:45 UTC), which, over the course of a day has increased the output arm's temperature by 1 deg C, or ~2 deg F. Perhaps a set point got lost?
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After receiving a call from the control room regarding a temperature increase in the HAM 6 area, Tyler and I looked at the FMCS and found that for some reason, AHU 2 was off, both fans down. There has been some fire panel testing which may have contributed to this issue. AHU 2 was restarted and both fans came back up. Made a few adjustments to the dampers for air flow and all seems to be running as designed. I will continue to monitor.
AHU = Air Handler Unit FIXED IT.