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Old 12-18-2012, 05:39 PM
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Oops 440v Into a 220v Century 160 MIG - Now What?

Long story short. I took a new-to-me Century 160 MIG welder and wired it up to a 1phase 440v supply. (Not intentionally.) Flicked on the power switch and got a loud bang in about 4 seconds. The short tripped the supply breaker. I did not use the trigger on the gun.

Opened up the unit and the control transformer (aka the "Drive Transformer") primary winding is clearly blown and melted. No other obvious damage that I can see. I tried calling the Century tech support line a few times but no human contact. I got creative and called my local Lincoln repair facility and they tell me that sometimes the only thing that blows is this transformer and other times it takes out more stuff - such as the controller board downstream of the transformer.

I have removed the damaged control transformer and have deduced that the specs for it (off the Century parts list) are 230VAC in 24VAC out 6amp rating. I have ordered a 240vac to 24vac 150 VA transformer from automation direct and intend to quickly hook it up, apply correct supply voltage (208 in my case) and see if it works and that nothing else seems to be inop. If so then I will permanently mount the new control transformer and move on.

Is there anything else I should be aware of or think about? Thanks for reading and I appreciate any advice you guys might have.

Sparky.
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