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Entry  Tue Apr 2 18:40:01 2019, gautam, Update, VAC, Vac failure vacFail.png
    Reply  Wed Apr 3 09:07:46 2019, gautam, Update, VAC, Vac failure vacFailOvernight.png
       Reply  Wed Apr 3 10:42:36 2019, gautam, Update, VAC, TP2 forepump replaced 
          Reply  Wed Apr 3 16:17:17 2019, Jon, Update, VAC, TP2 forepump replaced IMG_3180.jpg
             Reply  Wed Apr 3 18:35:54 2019, gautam, Update, VAC, PSL shutter re-opened 
                Reply  Fri Apr 5 01:10:18 2019, gautam, Update, VAC, TP3 forepump is also noisy 
             Reply  Tue Apr 16 22:06:51 2019, gautam, Update, VAC, Vac interlock tripped again Screenshot_from_2019-04-16_22-05-47.pngScreenshot_from_2019-04-16_22-06-02.png
                Reply  Wed Apr 17 18:12:06 2019, gautam, Update, VAC, Vac interlock tripped again Screenshot_from_2019-04-17_18-11-45.pngScreenshot_from_2019-04-17_18-21-30.png
Message ID: 14546     Entry time: Tue Apr 16 22:06:51 2019     In reply to: 14514     Reply to this: 14550
Author: gautam 
Type: Update 
Category: VAC 
Subject: Vac interlock tripped again 

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.

Attachment 1: Screenshot_from_2019-04-16_22-05-47.png  30 kB  Uploaded Tue Apr 16 23:14:16 2019  | Hide | Hide all
Attachment 2: Screenshot_from_2019-04-16_22-06-02.png  26 kB  Uploaded Tue Apr 16 23:14:25 2019  | Hide | Hide all
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