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  1. #1
    Join Date
    Oct 2011
    Posts
    4

    Default 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. #2
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,617

    Default

    You blew a rectifier diode

  3. #3
    Join Date
    Oct 2011
    Posts
    4

    Default mm200

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

  4. #4
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,191

    Default

    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 at 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

  5. #5
    Join Date
    Oct 2011
    Posts
    4

    Default

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

  6. #6
    Join Date
    Oct 2011
    Posts
    4

    Default

    Thanks it works great now

  7. #7
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,191

    Default

    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

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