Generac 04077-1, 04109-1, 04079-1, 00789-1, 00844-1 manual Voltage Regulator Adjustment

Section 3 — Post-installation Start-up Adjustments

Guardian Air-cooled Generators

	3.7.3 SOUND ATTENUATED UNITS	Figure 3.4 – Voltage Adjustment Potentiometer
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1.Carefully inspect the governor anti-lash spring (Figure 3.3). Be sure it is not broken or disengaged.

2.Loosen the governor clamp nut. Then, push the spring end of the governor lever all the way up (wide open throttle).

3.Hold the governor lever at wide open throttle and insert the tip of a screwdriver into the slotted end of the governor shaft.

•Hold the governor lever at wide open throttle and rotate the governor shaft fully counterclockwise.

•Hold the governor shaft fully counterclockwise and tighten the governor clamp nut to 70 inch- pounds (8 N-m) torque.

Figure 3.3 – Sound Attenuated

Engine Governor Adjustment

3.8VOLTAGE REGULATOR

ADJUSTMENT

With the frequency between 61-62 Hertz, slowly turn the slotted potentiometer (Figure 3.4) until line volt- age reads 244-252 volts.

NOTE:

You must remove the roof to adjust the voltage regulator on nonsound attenuated units.

NOTE:

The voltage regulator is housed in the generator's control panel. The regulator maintains a voltage in direct proportion to frequency at a 2- to-1 ratio. For example, at 62 Hertz, line-to-neu- tral voltage will be 124 volts.

3.9OVERSPEED ADJUSTMENT

◆3.9.1 6 KW, 8 KW AND 10 KW UNITS (NON-SA)

See item 3 of Section 1.15 on Page 15 for overspeed adjustment information for these units.

◆3.9.2 SOUND ATTENUATED UNITS

Use the following overspeed adjustment procedure:

1.For initial setting, turn the potentiometer fully clockwise.*

2.Start the engine and increase the governed speed setting to 72 Hertz (62 Hertz for 50 Hertz rated units).

*NOTE:

If immediate shutdown occurs when the engine starts, reverse the potentiometer setting done in item 1.

3.Turn the adjustment potentiometer slowly until the engine shuts down.

4.Readjust the governor to the rated speed.

Generac® Power Systems, Inc. 25