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Entry  Mon Jun 11 16:08:58 2012, Jenne, Update, Environment, Rattling in the HEPA 
    Reply  Mon Jun 11 21:35:55 2012, Jenne, Update, Environment, Rattling in the HEPA 
       Reply  Fri Oct 31 11:46:15 2014, manasa, Update, , Rattling HEPA : Eventually stops 
          Reply  Fri Oct 31 15:34:47 2014, Steve, Update, PSL, PSL HEPAs are running again HepaVariac.jpg
Message ID: 6793     Entry time: Mon Jun 11 21:35:55 2012     In reply to: 6792     Reply to this: 10657
Author: Jenne 
Type: Update 
Category: Environment 
Subject: Rattling in the HEPA 

Quote:

There is an intermittent rattling sound coming from the HEPA in the NE corner of the PSL table (right above the PMC, all of our input optics).

Steve says it might be a bad bearing, but he'll check it out in the morning and get it fixed.

 MC was having a hard time staying locked, with no discernable reason from the control room (i.e. no big seismic, no PMC PZT railing).    The HEPA was on 100%, so I turned it down to 50% to hopefully reduce the rattling, if that was what was wrong. 

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