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Tool Talk Discussion Forum

Any Hobart welder experts here? (long)

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S. Crum

11-19-2007 06:01:12




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I have a Hobart G3010 300 AMP engine drive welder/generator I'm just finishing up restoring.
I had it running yesterday and it runs, welds and generates real nice. I have found a few quirks with it I would like to straighten out or at least understand better. First is the electronic engine control, This has a toggle switch on the control panel for RUN or IDLE, as this was wired the switch had no effect and the engine ran at full governed speed. I'm not sure if this was wired correct when I bought this. I would like to get a wiring schematic for this part of the system as it is not in my Hobart manual. My understanding is that in the run position the engine will idle until a load is sensed the the contol will kick the engine up to full governed speed, and return to idle when the load is removed. Is this correct? In the idle position the engine is supposed to stay at idle?
Second is the WELD voltage control, this is the smaller black knob in the center of the WELD AMPERAGE control. I should be able to vary the WELD VOLTAGE between 40 and 80 volts which I can. However when I turn the knob the lower the WELD VOLTAGE the GENERATOR VOLTAGE also varies ie; when the WELD VOLTAGE is set down to 40 volt I only have 33 volts on the 40 amp 240 volt plug. When I turn the WELD VOLTAGE knob up so the meter reads 80 WELD VOLTS I have 252 VOLTS at the receptical but I can vary the GENERATOR VOLTS any where I want them using the WELD VOLTAGE knob. I don't know as this is supposed to happen. The welding generator is a separate system from the 10 KW alternator system as I understand this. Or am I wrong? Nobody has replied to these questions on the Hobart discussion board yet.

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135 Fan

11-19-2007 19:00:18




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 Re: Any Hobart welder experts here? (long) in reply to S. Crum, 11-19-2007 06:01:12  
I agree with what was said. I have seen other welders where the fine current control had to be set at maximum for aux. power. Some idle controls work on a vacuum. Another thing to check is that the cables aren't frayed and causing enough of a short for the engine to not idle. I sold an old Airco welder that did this because the cables the buyer put on it weren't in the best shape and were rapped on cable hooks side by side. Dave

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Rick Dant

11-19-2007 08:21:35




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 Re: Any Hobart welder experts here? (long) in reply to S. Crum, 11-19-2007 06:01:12  
You may have an issue with the idle solenoid/idle control board. Your welder is supposed to idle until it senses a load of more than 1/2 amp then go to high idle, either on the weld output or the generator output. Your fine voltage control is working as designed...as you turn the fine control down you also turn down the auxilary voltage and vice versa



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