Wire Speed Gone Crazy MM200
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  1. #1
    Join Date
    Jul 2012
    Honey Grove, TX

    Wire Speed Gone Crazy MM200

    Hey guys I got a Millermatic 200 the old school white face. Had it for several years now and never had a problem. Welded some stuff up this weekend and it did fine. Went to fire it up yesterday and the wire kept burning back to the tip. I messed with it and finally just grabbed my smaller multimatic and got the job done. Today I blew the dust out of it which been needing done for awhile then got some scrap to see if maybe it would work right. Now the speed has gone crazy on it no matter where I turn it the wire is going super fast I can have it on 0 on speed and high 5 on voltage and its still fast. I'm guessing the knob went out. Where would I get a replacement? and this has to be it right. I do have some electrical experience I have got the multimeter ahold of anything past just checking the voltage going into the machine and after switch.

  2. #2
    Join Date
    Mar 2010
    Ceres, California

    Re: Wire Speed Gone Crazy MM200

    you will want to test the speed control with an ohmmeter. make sure it is not shorted or damaged. wires twisted up.
    If that is good, then the motor control pcb has failed. If motor stuck at high speed the SCR might be shorted.
    You can have it repaired or buy a new one from Miller. Send me a PM if you think you can repair it your self.

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