corey.gray@LIGO.ORG - posted 00:04, Thursday 18 February 2016 - last comment - 21:02, Thursday 18 February 2016(25609)
HAM5 ISI Tripping Today
Had a couple of random HAM5 ISI/SRM_M1 watchdog trips. For both watchdog trips, it looks like HAM5ISI is first. The trips happened during two different states of working on H1.
1) At end of TJs shift when there was a lockloss from DRMI. The GS13s & Actuators both hit their limits. NOTE: on this one, SR3 was quite a bit off in yaw!
2) While aligning H1, HAM5 tripped in a similar way. NOTE: No issue with SR3 here!
For both cases, all the M1 OSEM RMS values start increasing (not enough to trip the WD), but it's interesting to see them all ramp up.
For the first case, Sheila made a change to Guardian to make sure we look at when DRMI drops out of lock. Still not really sure what caused case #2.
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In the first case, plot 9, the ISC input goes up with a big ramp until the WD trip. Is it possible that SR3 was driven into the stop by some ?? control signal, and that the whack of the impact saturated the GS-13s (like the fast shutter on HAM6) which made the ISI trip? I don't see that in the second one, though. So even if true, that is not the only issue