Another breaker tripping problem

[Crazyman]

Thanks Kevin. If the transformer has a short wouldn't it do it on 460?

[Crazyman]

Serial # kk025163
stock# 903604

[Crazyman]

I have also checked the plug from the welder when it's switched to 230v and it reads fine. Nothing going to ground or shorting out like it seems.

[Crazyman]

I've checked the plug from panel. I switched it back over to 480v turned it on and it doesn't trip the breaker. Could the diagriam that shows how to change it over be wrong?

[Crazyman]

I have a Millermatic 250 that I got from work. It worked fine at work with 460v. I switched it over to 230v and it trips the breaker (50amp) as soon as I turn it on. I can change it back to 460 and it don't trip the breaker. (But of corse on 460v it doesn't work right)