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Internal External Generator Ground

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Wayne Mo

10-01-2002 20:45:42




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Is there any way to tell an internally grounded generator from an externally grounded generator without tearing it apart and looking at the wiring inside?




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David Coe in MD

10-01-2002 22:12:22




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 Re: Internal External Generator Ground in reply to Wayne Mo, 10-01-2002 20:45:42  
i'm no expert, but I think you can just count the terminals. Armature
and Field means internally-grounded; Armature, Field, and Ground means
externally-grounded.

Others will enlighten us if I'm wrong... and, knowing all the variety
out there, there are probably oddities I haven't considered.



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Dell (WA)

10-02-2002 00:01:35




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 Re: Re: Internal External Generator Ground in reply to David Coe in MD, 10-01-2002 22:12:22  
Wayne..... ..what Coe said..... ..and.....
All generators and alternators that I know about are internally grounded. BUT..... .

There are generators and alternators and voltage regulators that are mounted on rubber baby buggy bumper isolators for vibration purposes. Well guess what? All that isolation has to be jumped around with external ground wires to provide electrial continuitity.

This was the electrical system originally installed on the 8N. Voltage regulator was mounted on rubber vibration isolators. And guess what? If the generator and voltage regulator are NOT electrically connected by an external ground wire, voltage regulator DOES NOT WORK.

They've improved (?) the latest 8N 6 volt regulator and it no longer is mounted on rubber vibration bushings, and the V/R is now internally grounded to an adaptor plate which is externally connected by a wire back to the 6 volt generator..... ..... Dell

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Wayne Mo

10-02-2002 20:34:08




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 Re: Re: Re: Internal External Generator Ground in reply to Dell (WA), 10-02-2002 00:01:35  
I always thought the ground wire from the gen to reg was just a safety redundant thing like you are basically saying. But when one side of the field goes to ground inside the gen and the other goes to the reg, I thought the reg put voltage onto the field wire flowing current back to the gen and to ground there. This is only in the case where the field is internally grounded in the gen. THe externally grounded systems have one side of the field connected to a 3rd brush or the hot brush and then the otherside of the field goes back to the reg where it is grounded to cause current to flow and energize the gen magnets. Am I missing something here? I thought I understood the system but now wonder!

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