Guardian Technologies 04389-2, 04456-2 Engine Governor Adjustment, Voltage Regulator Adjustment

Section 2 — Post Installation Start-up and Adjustments

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

If this procedure or the equipment are not available, locate the nearest Generac Guardian Dealer and they can perform the adjustments.

NOTE:

A service fee may be charged for this adjustment.

2.7ENGINE GOVERNOR ADJUSTMENT

If both AC frequency and voltage are correspondingly high or low, adjust the engine governor as follows:

◆2.7.1 7 KW UNITS

1.Loosen the governor clamp bolt (Figures 2.3).

2.Hold the governor lever at its wide open throttle position, and rotate the governor shaft clockwise as far as it will go. Then, tighten the governor lever clamp bolt to 70 inch-pounds (8 N-m).

3.Start the generator; let it stabilize and warm up at no-load.

4.Connect a frequency meter across the generators AC output leads.

5.Turn the speed adjust nut to obtain a frequency reading of 63 Hertz.

6.When frequency is correct at no load, check the AC voltage reading. If voltage is incorrect, the volt- age regulator may require adjustment.

Figure 2.3 — Engine Governor Adjustment

Idle Spring

Governor

Shaft

(Rotate

Clockwise)

Governor Clamp Bolt	No Load Idle
	Adjustment Screw

◆2.7.2 12 KW AND 15 KW UNITS

1.Loosen governor clamp bolt (See Figure 2.3).

2.Completely remove the idle spring.

3.With governor arm at wide open throttle position, rotate governor shaft fully clockwise. Tighten clamp bolt to 84 inch-pounds.

4.Start unit and apply full load. Use full load speed adjust screw (Figure 2.4) to adjust frequency to 58 Hz.

5.Remove load, stop engine, loosen the idle adjust screw and reconnect the idle spring.

Figure 2.4 — Full Load Speed Adjust Screw

Full Load Speed Adjust Screw

6.Using a hand, push the governor arm to the closed throttle position. Make sure the idle spring does not stretch at all.

7.Restart the unit.

8.Slowly turn the idle adjust screw to adjust the no- load idle frequency to 63-63.5 Hz (with door open).

9.The governor is now set.

◆2.7.3 ADDITIONAL CORROSION PROTECTION

Periodically spray all engine linkage parts and brack- ets with corrosion inhibiting spray such as WD-40 or a comparable product.

2.8VOLTAGE REGULATOR

ADJUSTMENT

With the frequency between 62-63 Hertz, slowly turn the slotted potentiometer (Figure 2.5) until line volt- age reads 247-252 volts.

Figure 2.5 – Voltage Adjustment Potentiometer

Generac® Power Systems, Inc. 13