[Sneap] sparking problem

[Arthur W Haberl]

Tom,
    Among other things, you need 250 volt MOVs to ground on every wire at the motor.  It wouldn't hurt to also have them at the exit from the tank.

    Art Haberl

  ----- Original Message ----- 
  From: Miller, Thomas Edward 
  To: sneap at tunl.duke.edu 
  Sent: Sunday, February 01, 2009 8:34 AM
  Subject: [Sneap] sparking problem








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  SNEAPERs:

   

  I need your advice. For our 2 drive motors inside the tank we have PI filters inside a metal box in series with the 2 motors. Connections from the tank feedthrus are made with copper conduit to the box and then to the motor. It was found that spark damage inside the copper conduit between the wires and the copper conduit had damaged the wires that are between the motor and PI filter box. What was done was the PI filter box was mounted outside the tank and the conduit connecting both the PI filter box to the tank feedthrus and the tank feedthrus to the motors was replaced with plastic conduit. What this did was bring the spark energy outside the tank where it can now damage equipment outside the tank. 

   

  What is your recommended solution, i.e. how have you guys done it?

   

  I would like to have a better robust filtering for the motors on the inside to prevent the spark energy from getting out of the tank and a better conduit system. Seems like spark energy is traveling thru the motor 208 VAC wires and needs to be removed right at the motor. Any help would be great.

   

  Thank you. Cheers!!!!

   

    Tom Miller

    Purdue University

    millerte at purdue.edu



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