aLIGO LHO Logbook

H1 SEI

hugh.radkins@LIGO.ORG - posted 13:37, Thursday 05 September 2013 - last comment - 10:19, Friday 06 September 2013(7636)

WHAM6 Corner1 Vertical HEPI Actuator Parker Valve swapped

Hugo & Jim reported a response error of HAM6 V1.  The IPS (Inductive Position Sensor) responded with opposite sign but good amplitude.  We visually checked the IPS and verified its sign was correct.  EE was called in for assistance and the outputs of the Pier Pod was verified to be consistent and correct.  Cables were swapped and we even drove V1 with the V4 Pod.  All suspects eliminated leaving the Actuator itself.  The Parker Valve has been swapped and the Actuator is now in bleed mode.

Old Valve SN: L170 replaced w/ L221.

Comments related to this report

hugh.radkins@LIGO.ORG - 10:19, Friday 06 September 2013 (7654)

Link

The Actuator was put back into run mode at 1405 pdt giving us 165minutes of bleed time.  More than enough for this vertical actuator given the reported experiences at MIT and LLO.

We ran another test and the sign anomaly still exists...?  Don't know what to say about that...