Reports until 17:01, Wednesday 18 April 2018
H1 ISC (SQZ)
marc.pirello@LIGO.ORG - posted 17:01, Wednesday 18 April 2018 (41529)
PZT Driver Chassis Issue Resolved

Tuesday night, about 8:30PM pacific time the PZT driver power supply for HAM6 and Squeezer tripped.  After checking the cabling and trying to restart the power supply, we determined that the PZT driver likely had a bad component.  The spare is still at Caltech, so we pulled the chassis from the rack and in the lab everything checked out ok (no bad components).  We discovered that the label on the power supply which indicated 100V at 2mA was incorrect.  With the addition of the squeezer, this supply is required to provide 110V and up to 100mA.  This label has been updated along with the correct procedure to bring the power supply back up from glitching.  This closes WP7439.

Nutsinee, Terry, Marc, Fil, Daniel