travis.sadecki@LIGO.ORG - posted 20:12, Saturday 11 March 2017 - last comment - 22:06, Saturday 11 March 2017(34753)
Ops Eve Mid-shift Summary
Struggling to get back to locking. Lots of FSS PZT oscillations since the PSL was brought back up. ETMX RMS watchdog has tripped several times. Got a few "Tidal X/Y error" messages, but not for an hour or so. We have made it as far as INCREASE_POWER a couple of times, but during the power up steps, got "OMC DCPD Saturation" notifications and lock was lost. Microseism is still very high and wind is picking back up. Looks like it will be a rough night.
The tidal alarms have been continuing so I called Keita. We looked at the tidal arm servos which seemed to be railing at their limits causing the alarm. I kept an eye on them and X arm had another alarm when it reached its limit of 10. At Keita's suggestion, I increased the limit to 12 and the signal ramped to -11.145 and stopped, so it appears it just needed a bit more range. I'll leave it at this value for tonight since we seem to be struggling with microseism which is still hovering around 1 um/s.
Another X arm tidal alarm. This time I increased the limit to 15 and the signal ramped to -13.679. I also now have a DIAG_MAIN message of 'TIDAL_LIMITS:X_COMM_CTRL output within 10 percent of limi'.