welder voltage schematic for Magna Tran Mag 300

[Newwelder]

I have just bought an old Magna Tran Mag 300 AC/DC Inert Arc Welder Model T134 Serial # F00515 It is a 220/440 volt machine set up for 440 volt usage. I know it can be set up for 220 volts but there is no wiring schematic or owners manual with the welder to show how. Can any one tell me where I can find or purchase a schematic or manual?? Newwelder

 

[Rock knocker]

You have opened up the back of the machine, correct?

 

[Newwelder]

You have opened up the back of the machine, correct?

Yes, some one ripped off the schematic off the rear panel. The welder was used to repair train cars and engines. Its a beast of a machine.

 

[Rock knocker]

I assume it's a three phase machine?

 

[Rock knocker]

You might want to try some other boards. Hobarts weld talk is my favorite Weld Talk Message Board and Online Forum - Hobart Welders there are many others. I'm guessing the machine is from 68 to 78?

 

[Newwelder]

Yes it's three phase and has a series of brass bars that can be shifted on to different lugs to change the voltage but they are not marked. I'll try the Hobat site also Thanks for the lead !!