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XRA feeder prob

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  • XRA feeder prob

    I have a Miller Extended Reach feeder ser # KF882824 that of a sudden developed a strange problem. In an instant it made a strange arc squeal and the voltage control POT on the power supply smoked and blew a 120V 3A AGC fuse. It was hooked up to an old Hobart PortaFlex that uses continuity for the contactor. When I began tracing wires I discovered that one of the wires in the contactor control circuit was hot when, using a VOM, touched the wire to the case on the feeder - 120VAC. This only occurs when the feeder is in play, even with the gun not connected so it has to be something in the feeder. I always thought that circuit for a contactor control was just a straight pass-through as it is only continuity and not controlling a switch or relay? And if it is a relay, how in the **** could it dump voltage into one leg? On top of that, there isn't anything that looks like a relay on the board.

    If anyone has knowledge or thoughts I'd appreciate feedback.

    I bought a $10 POT and hooked the gun up via a PSA-2 and a WC-24 and everything works fine which points to the feeder again.

  • #2
    Without a serial#, can't help much

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    • #3
      Originally posted by cruizer View Post
      Without a serial#, can't help much
      If you look, you will see that I gave the serial number, KF882824, in the first sentence. I can't help you, to help me, more than that!

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      • #4
        eyes must have been tired.....

        anyways, meter out your control cable first

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        • #5
          Originally posted by cruizer View Post
          eyes must have been tired.....anyways, meter out your control cable first
          First thing I did.

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          • #6
            Well if the case is hot then you have a short to ground, has to be the control cable or a failed auxillary transformer. Thats it. likely running too much or too little power to the XR-A.

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