Dan Mig 200 Amp weird issue.

[ng8264723]

Would this transformer work?

100VA Transformer Primary 120V 208V 240V 480V Volt 24V Secondary HVAC Furnace | eBay

4 Amp Fuse Protection.

www.ebay.com

 

[eddie49]

Yes, that transformer would be fine. It will run on 110 or 220, and the power rating is more than enough.
I suppose you could use the 208 or the 240 v connections for "220", depending on the actual exact voltage of your 220 supply. ( i.e. White and Red or White and Orange.)

Check the voltage marked on the fan. I think you will find it is 110v, so that regardless of whether you are set for 110 or 220, the fan is always connected across the 110 volt winding of the transformer. If the supply is 220, the "auto-transformer" effect of the primary will effectively step it down to 110 for the fan.
Before connecting the primary of the new transformer, set the jumpers for 110, power up the welder, and confirm which wires show 110 volts across them. The set it for 220, plug in to your 220 supply, and check the wires again.

As for the secondary, it is not clear what is going on. We don't have a circuit diagram, neither of the whole machine nor of the Control Box.
To me, the bridge rectifier looks like an add-on by a previous owner. Other Migatronic welders - on which the Dan-Mig is based - have a 24v AC supply going directly to the 9-pin plug, on two wires.

 

[ng8264723]

Unfortunately the fan is gone. The wires are there and the hole where it was but it is missing!
My shop has around 245-250 volts.
That's a good idea I was thinking of doing something like that.

I know I have two more Dan Mig's but they are 220 voltage only. Neither have the bridge rectifier. I will say the wire ends look old.

I can not find a wiring diagram for the welder anywhere. I could post a pic of the PCB board.

 

[ng8264723]

This is the board. I could send it to Les at Tech arc. He has done a few boards for me. I could ask him to label all the wires if I can't figure it out and go through the board and replace things.