Generac 04389-1, 04456-1, 04390-1 2.8VOLTAGE REGULATOR ADJUSTMENT, 3.1BREAK-INPROCEDURE

Section 3 — Operation

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

◆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.

6.Using your 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.

Figure 2.4 — Full Load Speed Adjust Screw

Full Load Speed Adjust Screw

◆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.

NOTE:

You must remove the access panel on top of the control panel to adjust the voltage regulator.

Figure 2.5 – Voltage Adjustment Potentiometer

NOTE:

The voltage regulator is housed above the genera- tor's control panel. The regulator maintains a volt- age in direct proportion to frequency at a 2-to-1 ratio. For example, at 62 Hertz, line-to-neutral voltage will be 124 volts.

3.1BREAK-IN PROCEDURE

Once the unit has been installed and all electrical checks have been made, it is strongly recommended that the following “Break-in Procedure” be completed to ensure correct generator operation in the future.

1.Set the generator’s Auto/Off/Manual switch to AUTO.

2.Turn OFF the utility power supply to the transfer switch using the means provided (such as a utili- ty main line circuit breaker).

3.The unit will start, and the transfer switch will transfer to standby.

4.Using the transfer switch’s built-in emergency load center, turn on circuits to load the generator to approximately 25% rated load and run the unit for one hour.

5.Run the unit for one hour at 50% rated load.

6.Run the unit for one hour at 75% rated load.

7.Run the unit for one hour at 100% rated load.

8.Turn ON the utility power supply to the transfer switch, which will allow the transfer switch to transfer back to utility power. The unit will con- tinue to run for one minute and then shut down.

9.Allow the unit to cool.

10.Set the generator's Auto/Off/Manual switch to OFF. Remove the 5A and 15A fuses from the gen- erator control panel. Disconnect the battery cables as outlined in “General Hazards” (page 2).

Generac® Power Systems, Inc. 13