Figure 33. Generator regulator adjustment and test wiring diagram.
counterclockwise to decrease the closing voltage. Set closing voltage at 26 volts.
(b)
Voltage regulator opening voltage. With voltmeter connected as shown on 5, figure 33, increase rpm to
operating speed. Observe reading on voltmeter. It should read between 27.5 and 29.5 volts. If adjustment is
necessary, turn the voltage regulator adjusting screw clockwise to increase and counterclockwise to decrease.
Set voltage at 28.5 volts.
(c)
Current regulator maximum amperage. With ammeter connected as shown on 6, figure 33 and either the test
set carbon pile load set u at 25 to 30 amps or, first having operated the starter for 10 to 15 seconds to provide
the load, increase rpm to operating speed, observe reading on ammeter at which points first vibrate. This
should be between 38 and 42 amperes. If adjustment is necessary, adjust the current regulator to 40 amperes
in the same manner as the voltage regulator was adjusted.
(d)
Replace generator regulator cover and repeat all tests before removing adapters. Run regulator voltage
AGO 8156A
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