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xmt 304 Blew SR-1 varistor and plug needs to be replaced - need help

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  • xmt 304 Blew SR-1 varistor and plug needs to be replaced - need help

    I just got an xmt 304. it had a three phase plug. I hooked it up to my rotary phase converter and the unit powered up with no fault indications. I couldn't weld because i didn't have a torch. My torch arrived and i changed the plug to single phase. As soon as i flipped the on switch i heard a loud pop. I took the cover off and found one of the varistors on the SR-1 board burned right through one of the leads. There is also a 6 prong plug right next to the burned varistor. the plug got damaged. IDK if the plug shorted or the varistor shorted.
    Anyway, i ordered a new varistor. where can i get a new plug?
    also when i replace the varistor is there a polarity?
    Anyone have any idea why this could have happened? three phase seemed fine, single phase blew up. I might also have fried the main disconnect switch. it seems to not work smoothly now. Thanks in advance for any help.

  • #2
    First place to look is how the new input power plug was wired. Next is the Auto-Link circuit that handles the incoming power.

    You just got it, but from what source? KNOWN to be welding just fine before you got it?
    Last edited by MAC702; 01-01-2020, 10:45 AM.

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    • #3
      not known whether the unit worked or not. i was looking at the machine all day. i found that the furnas auxiliary contactor was stuck. I freed it up and got the welder to turn on using 3 phase power. I haven't tried striking an arc yet. maybe tomorrow

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      • #4
        Do you need the socket or the plug? I have an extra input protection board with the socket I can send you.
        Last edited by jjohn76; 01-02-2020, 08:57 AM.

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        • #5
          thanks John i need the six pin socket. How much do you want for the board? This is the board with all the red varistors on it correct?

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          • #6
            Just send me a PM with your address. It's what is left of that board ... Which contactor was stuck? Was it the left or right one? I had the left one stuck, which is the 460V one and basically connects. The rectified + and - of the DC bus when the right one clicks on. Fortunately, I had light bulbs in series with my input lines (cheap short/surge limiter/detector) and caught it before it did major damage.

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            • #7
              PM sent to JOHN

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              • #8
                Should be there by Monday. Hopefully those new contactors fit. The replacement ones I received were too wide for the model I had (LJ if I remember right).

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                • #9
                  Thank you SIR!

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