patrick.thomas@LIGO.ORG - posted 18:50, Monday 06 June 2016 - last comment - 19:55, Monday 06 June 2016(27593)
CP7 oscillating
I had to restart the TwinCAT code for h0vacex and h0vacey to add back the Inficon gauges that were disabled during the power outage. This reset the PID controls for CP8 and CP7. CP8 is back on PID but CP7 has been oscillating (see attached). At this point I am going to leave it on manual at 85% open before I leave. Someone from the vacuum group might want to monitor it.
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CP7 setpoint was raised to 94% because it overfilled last Friday during transition to generator power. Reboots today reset it to nominal 92%, which causes the PID loop to close valve, warming up the transfer line, and then it has a hard time catching up.