aLIGO LHO Logbook

LHO VE

chandra.romel@LIGO.ORG - posted 09:14, Wednesday 04 May 2016 - last comment - 21:54, Wednesday 04 May 2016(26995)

CP2 PID experiment

I am adjusting the CP2 LLCV PID parameters controlled by Beckhoff system. 

1. Set to manual mode at 35% open and adjust PI settings while in manual mode and observe value in data viewer real time. PI still updates its values in manual mode. Note that every time a PID value is changes the LLCV % open value resets.


The pneumatic actuator is physically jouncing up and down and will wear out prematurely at current Beckhoff settings. 

The new electronic actuator on CP1 is not jolting as much as CP2, but up/down movement is still noticeable at rapid rate - PID parameters should be addressed.

Have not surveyed the other five actuators (CP3 doesn't count).

Comments related to this report

chandra.romel@LIGO.ORG - 18:50, Wednesday 04 May 2016 (27019)

Link

Unsuccessful in adjusting PI parameters today (P & I gains set too low from nominal 6 & 360 s. values, respectively), which significantly reduced the physical jitter in the LLCV by reducing % open signal amplitude but did not settle to the set point.

But good news! At the end of the day, Patrick provided the magic button. There is a way to apply a smoothing factor on the CP liquid level (0

kyle.ryan@LIGO.ORG - 21:54, Wednesday 04 May 2016 (27024)

Link

Good work Chandra - keep at it - this is a worthy pursuit for familiarity with the new Beckhoff controls - I will need you and Gerardo to brief me on the new environment as soon as time permits