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3 brush to 2 brush generator 9n conversion

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Bob Canuck

08-26-2000 17:06:53




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My local dealer recently replaced my 9n's 3 brush generator with a two brush. He said the three brush isn't available anymore. After a hours use my battery is dead. He grounded the field terminal so that there is only one wire connection to the cut off relay. Do I need a vibrating regulator now to go with the two bursh system or is the cut off relay going to work with the field terminal grounded? Is my dealer's mechanic nuts and probably burnt out my cut off relay and possibly wrecked the new 2 brush generator by doing this?

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Claus

08-26-2000 17:18:56




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 Re: 3 brush to 2 brush generator 9n conversion in reply to Bob Canuck, 08-26-2000 17:06:53  
Well, maybe not nuts but ignorant. By grounding the field, the generator will put out in the vicinity of 20 to 30 amperes. This will kill any battery after a while. Buckle the plates, boil out the electrolyte. 3 brush generators are available. I would keep the 2 brush generator and add a voltage regulator. Just wire the field to the field, the armature to the armature and bat on the vr to the battery. You may also have a ground terminal on the generator. You can wire this to the case of the vr. If your battery went dead, the cutout or the gen could be ruined.
Hope for the best
Claus

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Claus

08-26-2000 17:37:36




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 Re: Re: 3 brush to 2 brush generator 9n conversion in reply to Claus, 08-26-2000 17:18:56  
Addendum:
These generators are not self limiting in current and therefore are meant to be used with a vr that has a current sensing coil (As well as voltage sensing) to limit the output of the generator. If the field is grounded and the cutout relay is open (Destroyed) the full output is applied to the field and one grounds the field, the generator will probably avalanche (Higher voltage applied to the field increases the magnetic field which increases the output ad infinitum) and destroy itself. This is ok to do for a test for defective vr... but never leave the field grounded.
Happy Motoring
Claus

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