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Shopmaster blows breaker MIG only

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  • #31
    Ten minutes later, it is a little different.
    Before (by mistake) I had the output contactor switched on. With it set to remote, and the gun voltage at 20V, wire feed at 350 ipm, it welds fine. When I increase the voltage to 24V (machine is on), the instant the wire hits the work piece, the breaker pops. I tried this twice; 20V is fine, 24V pops the breaker.

    Frustrating situation. Maybe time to pick a repair shop.

    Steve

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    • #32
      Or, get more power to your shop, as this unit takes a 100 amp breaker.

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      • #33
        I've got plenty of history on 50A breakers with no problems. I don't think you're on the right track with the 100A breaker.

        Steve

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        • #34
          OK, you figure it out, works fine on 20 volts, blows breaker on 24 volts. Obviously drwing more power. Power you don't have....

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          • #35
            Lemo gets the gold star. It was (still) the breaker. Cruizer gets huge appreciation for all the details; he's also right, just not exactly what he thought. Thanks guys.

            The new symptoms came with the new 80A breaker, which I somehow didn't realize (it was new...). When I switched to my other 50A circuit, I got the old symptoms back. In the process, I realized that I had an unused (i.e. new 3 years ago) 50A breaker in another spot on the panel. I connected to it and now have no welder problems.

            Long term, I expect the problem will come back. When it does I'll buy a larger breaker from a more reputable source. The 80A came from Amazon/"TradeBelow"; it was cheap, but I sent it back as not working right. It did not work as well as my 50A breakers.

            Funny thing, a friend of mine just put in two 50A breakers (new). One of them was bad. Just a coincidence, I'm sure.

            Steve
            Last edited by sajurcaju; 12-29-2013, 03:29 PM.

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