jameson.rollins@LIGO.ORG - posted 09:10, Friday 16 May 2014 - last comment - 15:26, Saturday 17 May 2014(11936)
BS ISI stage 2 GS13 watchdog tripped
Came in this morning to find the BS ISI stage 2 GS13 watchdog tripped. Unclear why.
The strange thing is that the trip appears to have occured at GPS 1084253752, which is 10:30pm last night, whereas commissioning finished up around 4:30am. Did they just run with the BS tripped all night?
The watchdog was reset and guardian recovered everything fine.
The ISI-BS is a little peculiar: we know that the Michelson feedback could send a kick to the ISI and trip ST2 watchdogs. It's very often that the commissioners work with ST2 tripped, and I wouldn't be surprised that's what happened last night.
Given that, you should double check with the crew to see if it was really the case.
This was indeed the case. The michelson lock was kicking the BS and tripping stage 2, so they just ran with it tripped.
This is obviously an untennable solution, so we need to figure out how to prevent the BS ISI from tripping during acquisition.