Reports until 15:51, Monday 17 July 2023
LHO VE
david.barker@LIGO.ORG - posted 15:51, Monday 17 July 2023 (71417)
CP1 Fill Code now periodically checks the thermocouples are in range

This mornng we found that the CP1 thermocouples were out of range. The original CP1 fill code only checked the TCs on code startup and as part of each overfill pre-checks. It wasn't until I loaded my latest code this morning that the overnight TC issues became noticable.

I have made a second change to cp_overfill_ioc.py which now performs additional TC checks: hourly (GPS modulo 3600) and when the YAML file is read in (which defines the TC nominal range).

I have commandeered the vacuum SDF as a way of bringing out-of-bounds TCs to the overview. The channel H1:VAC-CP1_OVERFILL_TC_STATE was added to the h1vacuumsdf monitor.req and safe.snap. Its value should be 0x3 (bit0=TCA, bit1=TCB).

Attachment shows a test case where TCA nominal min was raised to -50C.

Images attached to this report