Posted by Bob M on July 10, 2009 at 07:11:57 from (74.74.133.11):
In Reply to: Adjust/repair V/R? posted by GordoSD on July 10, 2009 at 06:06:04:
Gordo -
The relay with its contacts held open by a spring is the cutout relay. Its purpose is to keep the battery from discharging through the generator when the engine is stopped. The cutout senses generator output and closes to connect the generator to the battery when the generator voltage exceeds the cutout's setting.
The other relay is the actual voltage regulator. It senses system voltage - its contacts open when battery voltage reaches the VR's setting (about 7.2 volts for a 6 volt system; about 14.4 for 12 volts). When open the VR's relay contacts interrupt current in the field circuit by inserting resistance into the circuit. This in turn causes generator voltage to drop.
When the VR relay is operating its contacts open and close very rapidly - many times a second.
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Bench testing and adjusting a VR requires specialized instruments and a high output variable voltage power supply.
However the regultor voltage relay setting CAN be adjusted on the tractor if you have a good quality, accurate VOM or DVM and some patience.
Setting the cutout is more fussy. And if you don't get it exactly right you risk a dead battery and possibly a burned out generator.
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