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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: 14512     Entry time: Wed Apr 3 10:42:36 2019     In reply to: 14511     Reply to this: 14514
Author: gautam 
Type: Update 
Category: VAC 
Subject: TP2 forepump replaced 

Bob and Chub concluded that the drypump that serves as TP2's forepump had failed. Steve had told me the whereabouts of a spare Agilent IDP-7. This was meant to be a replacement for the TP3 foreline pump when it failed, but we decided to swap it in while diagnosing the failed drypump (which had 2182 hours continuous running according to the hour counter). Sure enough, the spare pump spun up and the TP2fl pressure dropped at a rate consistent with what is expected. I was then able to spin up TP1, TP2 and TP3. 

However, when opening V4 (the foreline of TP1 pumped by TP2), I heard a loud repeated click track (~5Hz) from the electronics rack. Shortly after, the interlocks shut down all the TPs again, citing "AC power loss". Something is not right, I leave it to Jon and Chub to investigate.

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