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Entry  Fri May 13 23:04:58 2011, Suresh, Update, RF System, DC power supply on RF distribution box has been replaced. P5130120.JPG
    Reply  Sat May 14 14:12:16 2011, Koji, Update, RF System, DC power supply on RF distribution box has been replaced. sorensen.png
       Reply  Wed May 18 15:54:50 2011, Koji, Update, RF System, DC power supplies for the RF generation box in place 
          Reply  Wed May 18 17:06:39 2011, Suresh, Update, RF System, DC power supplies for the RF generation box in place 
    Reply  Sat May 14 14:50:21 2011, Koji, Update, LSC, 1Y2 5V Blown Fuse found -> Fixed 1Y2_5V_Fuse.JPG
Message ID: 4716     Entry time: Sat May 14 14:12:16 2011     In reply to: 4715     Reply to this: 4738
Author: Koji 
Type: Update 
Category: RF System 
Subject: DC power supply on RF distribution box has been replaced. 

Key points of the power supply installation

  • We followed the grounding configuration for KEPCO except for the signal ground connection
  • AC power supply has been obtained from the local power strip. This also provides chassis earthing (for safety)
  • The chassis is connected to the shieldin of the DC supply cable. The other end should be isolated.
  • The low voltage side of Sorensen's DC outputs are connected in order to share the same reference  level.
  • The ground level is provided from the cross connect. The cable is connected between the cross connect ground to the sorencen.
    Unlike the KEPCO case, this cable does not have the current return, but just is to define the voltage level of those Sorensens.
  • New AC&DC cables have been nicely strain-relieved.

Quote:

[Steve, Koji, Suresh]

   We shifted two Sorensen power supplies from the Auxiliary rack next to 1X2 to 1Y2.  And have installed them there (pic below).  The local ground reference was picked up from the racks ground reference.  A shielded cable with two twisted pairs was used to make a new power cable for the RF rack.  Since we are using three of the four conductors (+18,+28 and ground), one of them is not connected to anything.  This situation can be improved in a future iteration when, for example, we might wish to relocate the Sorensens to a different rack.

   We are still working on changing the power supply to the RF source.  Will complete this early next week

 

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