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problem with my dialarc 250 ac/dc

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  • problem with my dialarc 250 ac/dc

    I have a dialarc 250 ac/dc with hf that will blow fuses on startup. I've been using this machine for the odd small job for a couple years now. I was just welding the other day for about half an hour when my welder started making a louder buzzing noise and blew a fuse. I replaced the fuse and same thing happened right when I started it up.

    What would likely be wrong with it? Any help would be appreciated, thanks in advance!

  • #2
    My first guess would be a couple of bad diodes. They usually seem to go bad in pairs. You might also have some bad capacitors- the big ones.

    Miller MM252
    Miller Bobcat 225NT
    Miller DialArc HF & DIY Cooler
    2 Miller Digital Elite and 3 Fixed Shade Helmets
    2 O/A torch sets
    DeWalt 18 volt 1/2" Driver/Drill
    DeWalt 18 volt 6 1/2" Metal Saw
    DeWalt Porta Band & SWAG Offroad V3 Table
    Milwaukee 8" Dry Cut Saw
    Milwaukee 14" Dry Cut Chop Saw / Delta Stand
    Milwaukee 9" Grinder
    2 Milwaukee 4 1/2" Grinders
    Milwaukee Hole Hawg 1/2" Drill
    Wallace 5 Ton Gantry
    Too many hand tools


    • #3
      I agree, you probably popped a diode - I've had it happen and it can put your machine on full load that's why your breaker tripped.

      Test to find the bad one - cheapest I found them was on ebay from a place that sells them for DIY wind power.
      "Beware of false knowledge; it is more dangerous than ignorance." ~George Bernard Shaw~

      Airco 300 Heliwelder
      Dialarc 250 AC/DC
      ESAB 161
      Invertec v250 and v300 Pro
      Spectrum 700 plasma
      Miller HF-15-1
      Dirty ugly tools - perfect