Millermatic 130 auto arc problem

[ram42]

Hello everyone!I have a millermatic 130 auto arc that was given to me with problems. It was known to have a problem but had been sitting in a garage for 15 years or so(not really sure). The problem is, it will kick out the circuit breaker when i squeeze the gun trigger trying to run out wire. First I unhooked the wire and gun making sure no short there. Did a test and just as soon as i squeeze the trigger like its full bore welding and about 10 seconds later circuit breaker trips. I sent it in to a shop and they said the firing circuit card was bad and they couldn't get a replacement. I searched the internet and found a place that had a board and they tested it and sent it. I changed the card out and still have same trouble. Any ideas of where to check next? ps used the same plug as my 250.. Thanks.

[cruizer]

Did you jumper the trigger terminals at the machine with a paper clip or a piece of mig wire, cause the gun is the likely suspect....


Now when you say circuit breker, is tht the one on the machine or the breaker on the wall....

[elvis]

Is that machine a 240volt model? Or is your "250 outlet" a 115volt branch circuit?

[cruizer]

Ehh, never thought of that, most of the 130's were 120 powered, maybe a serial # would clarify?

[ram42]

Breaker on wall, and used a jumper wire for terminal at machine, also both units are 240 volts. serial number JF895874

[cruizer]

That particular machine doesn't come up even as an owners manual. Being a 1985, There isn't much info on it. Really want to verify on its data plate that it is a 230 model, Breaker on the wall goes, its a failed output diode.

[ram42]

Checked output diode it tested ok. I found that welding wire is always live some voltage is bleed thru, when the welding wire touches the ground cable without trigger pulled wire grabs turns red and melts

[elvis]

Still didn't address the input voltage as noted on the data of the machine. What does it say?

[ram42]

voltage on name plate 200/230