Need assistance

[WhiteKnight#1]

I am currently work on a CP-300 that Welds cold.. I checked the feeder and found a ground wire that had the insulation burned off of it. I bypassed the connector and went straight to the terminal strip. I checked the brushes and they seem fine. Anyone have any ideas ?

[cruizer]

And,,,, you have it hooked up to 3 phase??


OH, a FEEDER FEEDS WIRE, thats all it does, if the feeder is feeding ok, then its ok,

[M J Mauer]

Welcome to the forum.

[WhiteKnight#1]

I have also disconnected the fan to see if it was dragging it down. I still have the same result.

[cruizer]

Never did say if it was in a shop environment ie, 3 PHASE or not...., and a fan is NOT going to draw a machine down...., Going to make it shut down if its not working though....

[WhiteKnight#1]

This a shop environment. Welder is 230V 3 phase machine has an S52E feeder on it.

[duaneb55]

I checked the brushes and they seem fine.

Seem fine? Are they all free in their holders and making good contact with the transformer windings?

A straight CP 300 and not a CP 300 TS?

Did you clean the winding contact surfaces?

Did you check the contacts in the main contactor?

Was the machine just installed or previously operating at its present station?

Have you confirmed all three legs are hot?

If just installed, is it jumpered for the correct supply voltage?

[cruizer]

Information that is required,,,,,. Anyhow, we are going to guess and say that this machine has been in the shop for a while considering, its like 40 years old. Did you drop a phase like Duane is inquiring?

[WhiteKnight#1]

Checked 3 phase, and contacts in main contactor prior to posting. but double checked for sure. The machine was running fine and just started acting up. I rolled it out of the booth put another machine in it's place that works fine.

[duaneb55]

Forgot at least one - have you checked for one or more failed (open) weld output rectifier diodes?