3 phase welder
3 phase welder
I have a Hobart Model R400 3 phase welder (230 or 460 vac). Can I parallel all three transformers and run on single phase? Or can I just fed one transformer and run at reduced output? This is a 400 amp welder with a mag amp control. I don't need 400 amps, 150 would probably be plenty. Looks like I could just use the transformer that feds the control circuit. I would have to feed the cooling fan separately, but that would not be a problem. Any thoughts?
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Is it a DC welder, i.e., has a rectifier built in so that it's always a DC output? A three-phase welder, like the 3-phase alternator in a car, makes for some pretty smooth DC as far as ripple goes as compared to either standard half-wave or full-wave rectification.
Dean
Dean
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
Yes - it is a DC welder. You are right, the three phase is smoother. But if I run on single phase, I will have more ripple than on three phase.
dacflyer - I'm still trying to get a schematic in here some how. Not having much luck. I don't see an option to "add image to post". Sorry to be so dense. I haven't done much of this forum stuff. I'm still learning and I'm a little slow. Thanks for your help and patience.[/list][/list]
dacflyer - I'm still trying to get a schematic in here some how. Not having much luck. I don't see an option to "add image to post". Sorry to be so dense. I haven't done much of this forum stuff. I'm still learning and I'm a little slow. Thanks for your help and patience.[/list][/list]
OK - Hope this works.
Link to the schematic:
http://www.flickr.com/photos/22415457@N04/2159926133/
You can enlage it after it opens.
I think I can use just the "C" winding. Disconnect all of the primaries and secondaries of the "A" and "B" winding. This will cut down on the max current out, but I don't think that is a problem. This set up would allow the use of the high and low range outputs. The fan is 110 volts. I can feed it from a small transformer.
Link to the schematic:
http://www.flickr.com/photos/22415457@N04/2159926133/
You can enlage it after it opens.
I think I can use just the "C" winding. Disconnect all of the primaries and secondaries of the "A" and "B" winding. This will cut down on the max current out, but I don't think that is a problem. This set up would allow the use of the high and low range outputs. The fan is 110 volts. I can feed it from a small transformer.
Sorry - forgot to attach this page. This is the primary side. I will be using 240 vac.
http://www.flickr.com/photos/22415457@N04/[/img]
Thanks
http://www.flickr.com/photos/22415457@N04/[/img]
Thanks
- dacflyer
- Posts: 4748
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ok, i looked at the schematic,, looking at the primary schematic you shown.. use fig. 1 to switch the welder over for 230 volt operation..
just change the jumpers as shown in fig.1 its that easy..
then your power connections should be as 120v - 0v - 120v = 240 volt
before it was 208v - 208v - 208v = 3phase
good luck
just change the jumpers as shown in fig.1 its that easy..
then your power connections should be as 120v - 0v - 120v = 240 volt
before it was 208v - 208v - 208v = 3phase
good luck
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