Generac Power Systems 9 kW NG, 10 kW LP manual Test 17 Check And Adjust Voltage Regulator 12-20 kW

AC generators

Part 2

Section 2.4

Diagnostic tests

STEPPER MOTOR

PULL ARM THIS

DIRECTION TO

CLOSE THROTTLE

Figure 11. Throttle Positions 9/10 kW Units

STEPPER MOTOR

PULL ARM THIS

DIRECTION TO

CLOSE THROTTLE

STEPPER MOTOR ARM

Figure 12. Throttle Positions 9/10 kW Units

PULL ARM THIS

DIRECTION TO

CLOSE THROTTLE

STEPPER MOTOR

STEPPER MOTOR ARM

Figure 13. Throttle Positions 12-20 kW Units

BLACK

BROWN

YELLOW ORANGE RED

EMPTY

Figure 14. Six Pin Connector Wire Colors

Test 17 – Check And Adjust Voltage

Regulator (12-20 kW)

DISCUSSION:

For additional information, refer to description and components Section 2.1.

PROCEDURE (V-Twin Engine Units):

With the frequency at 60 Hertz, slowly turn the slotted potentiometer (Figure 15) until line voltage reads 247-249 volts.

NOTE: The access panel on top of the control panel must be removed to adjust the voltage regulator.

NOTE: The voltage regulator is housed in the back of the generator control panel. The regula- tor maintains a voltage in direct proportion to frequency at a 2-to-1 ratio. For example, at 60 Hertz, line-to-neutral voltage will be 120 volts.

Figure 15. Voltage Adjustment Potentiometer

RESULTS:

1.If the frequency and voltage are now good, discontinue tests.

2.If frequency is now good but voltage is high or low, refer back to flow chart.

Page 51