Reports until 12:07, Wednesday 20 March 2019
H1 SEI (OpsInfo)
jim.warner@LIGO.ORG - posted 12:07, Wednesday 20 March 2019 - last comment - 00:51, Thursday 21 March 2019(47719)
Earthquake Transition took us out of Observe

We got a notification of a 6.2 earthquake in Vanuatu this morning. When we started seeing effects in the ASC, we switched SEI_CONF to the EARTHQUAKE state, even though my plot put this earthquake barely into the LARGE_EQ state, the EARTHQUAKE state was the right response, I'll adjust this a bit. This knocked us out of observe, and we got some glitching in DARM below 100hz, so Jenne turned off the ADS. We may want to do this for future transitions to make the lock more robust, but it's unclear how it should be handled, that probably should knock us out of Observe. Eventually we lost lock, probably from some Sheila doing test on ETMX HEPI.

The SDF diffs that knocked us out of lock were HAM ISI sencor next chans, BSC ISI ST1 Z blend cur and next fms, and HEPI senscor next chans, Z only for the BSCs, X Y & Z for HAM1. I'll try to unmonitor these, so future transitions don't knock us out.

Also, the BS ST1 blend guardian didn't initially change the Z blend successfully, I had to init that guardian to get it to try again. It complained that it hadn't successfully switched, but didn't seem to be doing anything.

Comments related to this report
thomas.shaffer@LIGO.ORG - 00:51, Thursday 21 March 2019 (47734)

Re-requesting the state should force it into the correct configuration. Running INIT in an unknown configuration would just bring the node to a DOWN state because it doesn't know where to go. If this didn't work, please let me know.