Originally Posted by millman52  No I am talking about a 3 phase transformer type welder. A 400A 3 phase 220V that draws 65A. @220V. I have yet to find a single phase welder that will produce 350-400A @ 100% duty cycle. I don't think they even make one. Even the inverter type welders are 40-60% duty cycle on single phase. I could be mistaken but I don't think they will even produce the nameplate amperage on 220V single phase.....
You are correct about the motor/genset style I have a Hobart 300A that has a 15 HP motor on it. It runs fine on a 10HP RPC |
I don't follow you on the being able to produce the nameplate amperage, please restate.
From what I understand, and I am no expert on transformers, with setup in a false leg RPC you will not be able to gain you full amperage anyway. You would be talking a on big mother though, esp if you would like to run 100% duty cycle. You will be drawing around a 115 amps on your single phase at your 65 amp load roughly, if you can hook it up that way.
I figured it was a 3 phase transformer, we do alot of printing for miller, I was into to work on saturday and pulled all of the face plates we had in stock the only one that they currently make that we had is deltaweld, and one other invision something other. They had 100%DC for MIG, at 450 amps @ 38V
I figured that was around 70 amps draw.
I found this web site and they had a chart for
http://www.americanrotary.com/rotary...onverters.html
I would have to say at least 20HP but more like 25 HP. The duty cycle might be your problem in the end, you may really have to bump your HP to get that. I went to school for welding the biggest machines I used were 400a Lincolns they had 50%DC I would hate to think what that was like, 2-3 minutes of that and I was crawling out of my gloves and capo at 100% uck a whole hour.
chris