This happened again, about 30,000 seconds (~2:06pm local time according to the logfile) ago. The cited error was the same -
2019-04-16 14:06:05,538 - C1:Vac-error_status => VA6 closed. AC power loss.
Hard to believe there was any real power loss, nothing else in the lab seems to have been affected so I am inclined to suspect a buggy UPS communication channel. The PSL shutter was not closed - I believe the condition is for P1a to exceed 3 mtorr (it is at 1 mtorr right now), but perhaps this should be modified to close the PSL shutter in the event of any interlock tripping. Also, probably not a bad idea to send an email alert to the lab mailing list in the event of a vac interlock failure.
For tonight, I only plan to work with the EX ALS system anyways so I'm closing the PSL shutter, I'll work with Chub to restore the vacuum if he deems it okay tomorrow. |