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millermatic 200 blew fuse

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  • millermatic 200 blew fuse

    Hi im having some problem with my mm200 I was trying to weld some exhaust and it blew the circuit breaker in the garage so I reset it and try welding again about 30-60 sec later it happen again and the machine was hot the fan came on just before it blew

  • #2
    You blew a rectifier diode

    Comment


    • #3
      mm200

      So how do i and what do i need to check that

      Comment


      • #4
        You're going to have to isolate the weld output rectifier diodes (disconnect them) and check to see which one(s) shorted. I suggest you replace all four keeping in mind there are two straight and two reverse polarity units.

        Do you have a Volt Ohm Meter (VOM)? If not, you'll need one. PM me an email address for a test procedure document that's too large to upload here or just Google "how to test a diode" or similar search phrase.



        I suspect your next question will be where to get replacements.

        miller4less is one place:
        http://miller4less.com/advanced_sear...90j6nt5u32s3i5

        and . . .
        http://miller4less.com/advanced_sear...90j6nt5u32s3i5

        . . . or do a search for those IN4048 and IN4048R numbers to find a host of sources for the 275A, 300V rated stud mounted units.
        Last edited by duaneb55; 10-16-2011, 01:50 PM.
        MM200 w/spot controller and Spoolmatic 1
        Syncrowave 180 SD
        Bobcat 225G Plus LPG/NG w/14-pin*
        *Homemade Suitcase Wire Feeder
        *HF-251D-1
        *WC-1S & Spoolmatic 1
        PakMaster 100XL
        Marquette "Star Jet" 21-110

        Comment


        • #5
          Thank im going to try that and see what happen I do appreciate the help

          Comment


          • #6
            Thanks it works great now

            Comment


            • #7
              So was it a shorted output diode??
              MM200 w/spot controller and Spoolmatic 1
              Syncrowave 180 SD
              Bobcat 225G Plus LPG/NG w/14-pin*
              *Homemade Suitcase Wire Feeder
              *HF-251D-1
              *WC-1S & Spoolmatic 1
              PakMaster 100XL
              Marquette "Star Jet" 21-110

              Comment

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