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6 volt 8N polerization for generator

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GREG

04-24-2001 17:01:31




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I am trying to polerize my generator for my positive grd system. I have tried to touch the field and bat terminals together at the reg, but gen still is putting out a voltage at the armature post that is a neg ground type voltage. I have 6V negative reading at the BAT terminal of the regulator and 7.5 to 8.0 volts positive at the ARM terminal on the regulator when running at operating speed.




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E. Andrews

04-25-2001 05:37:14




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 Re: 6 volt 8N polerization for generator in reply to GREG, 04-24-2001 17:01:31  
Read the post Claus made carefully. I was working on my brother's tractor and noticed that his regulator has printed on the cover polarize by shorting from Bat to Field. In numerous posts from the archives for this board, it's always from Arm to Bat. I'm sticking with the method decribed here.



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Claus

04-25-2001 09:21:10




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 Re: Re: 6 volt 8N polerization for generator in reply to E. Andrews, 04-25-2001 05:37:14  
Let me shed some light unto this. Just like starter relays, some are energized by applying 6/12 volts to the high side of the relay and the low side of the relay is grounded. On the 8n, the high side is always connected to the battery voltage and the circuit is completed by grounding the low side of the relay through the starter switch. The same applies to the field coils in the generator. The high side is connected to the armature and the low side is connected to ground via the regulator. (N type) On some generators, the low side of the field coil is connected permanently to ground and the high side is supplied a current by the voltage regulator. This is the type that you would jump the bat terminal to the field terminal. THIS IS NOT THE TYPE WE HAVE ON OUR Ns.
Happy Motoring
Claus

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Claus

04-25-2001 04:59:42




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 Re: 6 volt 8N polerization for generator in reply to GREG, 04-24-2001 17:01:31  
To polarize the generator, connect a jumper wire from the bat terminal of the regulator to the armature terminal of the regulator. DO NOT HAVE THE TRACTOR RUNNING WHEN DOING THIS. IT COULD LEAD TO FAILURE OF THE REGULATOR. The connection needs to be only for a few seconds. Then disconnect. When disconnecting, you should see a spark.
This will apply a temporary current through the field coil to impart a residual magnetic field to the pole shoes. Happy Motoring
Claus

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peterc

04-24-2001 17:43:00




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 Re: 6 volt 8N polerization for generator in reply to GREG, 04-24-2001 17:01:31  
I think you need to ground the field terminal and momentarily with a jumper wire touch the bat terminal to the arm terminal.



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