Posted by Bob on July 10, 2009 at 07:08:54 from (69.178.228.68):
In Reply to: Adjust/repair V/R? posted by GordoSD on July 10, 2009 at 06:06:04:
The normally open points are the "CUTOUT" that CONNECTS the generator to the battery while it's charging and disconnects the generator from the battery when it's NOT charging.
Those points should initially close when the generator begins charging and the voltage comes up to about 8 Volts, then drop out when the generator voltage drops about 1-1/2 Volts below the closing voltage. (These are generic numbers for a 6-Volt system there would have been EXACT values for the OEM regulator shown ion the service manual.) Increasing the spring tension on the cutout points cause later closing and earlier opening.
The other relay (in this 2-relay regulator) controls charging Voltage AND limits charging current. It is wound with a SHUNT coil of fine wire that produces increasing magnetism as the charging voltage rises and a SERIES coil of heavy wire that produces increasing magnetism as the charging CURRENT rises. When the magnetism produced by the coil is strong enough to pull the points apart, the field is no longer fully grounded, but now has a resistor in series to ground, dropping the charging rate. The points actually vibrate, controlling the charging rate at the desired level.
Increasing spring tension holding those points closed INCREASES the charging rate.
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