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Welding Shop

Lincoln Electrics , 400AS-50 Welding Machine .

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Old 03-10-2014, 06:14:52 AM
Watkins Katu Watkins Katu is offline
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Thumbs up Lincoln Electrics , 400AS-50 Welding Machine .

I'm working on a Lincoln 400as-50 welding machine . It has no ac output . I changed the brushes , both ac and welding brushes and changed both capacitors . Made a continuty test on all the windings , tested the rectifier pack which all seem to be ok . The engine side as no problems . Is there anything else I need to do or haven't done to get the desired output ? Please I realy need your help cause we have only this machine , that is now in great need . Thankyou in advance and am looking forward for your favourable response . Sincerely Watkins
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Old 03-11-2014, 10:47:24 PM
motormanjeff motormanjeff is offline
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Default Re: Lincoln Electrics , 400AS-50 Welding Machine .

I've not worked on this particular one, but on my 'Lincoln Classic II" which has a DC generator with an AC exciter that is rectified to excite the generator. Once I started it by applying power to the welding leads(which I've done many times with these lincolns) but we had the polatity wrong. after that I had no power anywhere. no 110ac, no welding current, nothing anywhere. to fix it I had to "flash the fields". To do this I put jumper leads on the 12volt starting battery and touched the exciter brushes. this is a very simple procedure, but it took me a week to figure out this was all that I needed. According to the lincoln book this is supposed to be done with the engine off. I tried twice and still had nothing, being frustrated after the second time and a week of testing diodes and such, so I still had the thing running and thought what the heck, I touched the brush connections with my jumpers and it arced and like magic I had 124volts at my ac plug and about 102 ocv at the welding leads It's worked great ever since. I've seen the machines with the dc exciter get the polarity turned around. To fix this you just "flash the fields" to correct it
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Old 03-23-2014, 06:26:46 PM
Brian Howard Brian Howard is offline
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Default Re: Lincoln Electrics , 400AS-50 Welding Machine .

Scribd has a manual that has some good troubleshooting tips.
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