chandra.romel@LIGO.ORG - posted 11:45, Wednesday 14 December 2016 - last comment - 11:53, Wednesday 14 December 2016(32564)
CP3 overfill with new automation code
Patrick, Dave, Kyle, Chandra
First test of Patrick's automation overfill code successful! Took 33 min. to overfill CP3 at 50% open on LLCV (from 18%). Raised nominal to 19% after fill.
Next test will be on CP4 by lifting leads of one TC and setting beckhoff settings to "disable" and "PID" modes to see if code corrects those.
here is a strip-tool plot of the autofill. The red line is the fill valve %-open, goes to 50% during the overfill. The blue and green lines are the two thermocouples, which drop to -60C when the LN2 reaches the overflow outlet (code stops the overfill when TC<-30C).