Generac Power Systems 04389-3, 04456-3, 04390-3 Voltage Regulator Adjustment, Break-In Procedure

Section 3 — Operation

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

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 2.6) until line volt- age reads 247-252 volts.

Figure 2.6 – Voltage Adjustment Potentiometer

NOTE:

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

NOTE:

The voltage regulator is housed above the gen- erator's control panel. The regulator maintains a voltage in direct proportion to frequency at a 2-to-

1ratio. 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 utility 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 main circuit breaker to its OFF (or OPEN) position.

11.Set the generator's AUTO/OFF/MANUAL switch to OFF. Remove the 7.5A and 15A fuses from the generator control panel. Disconnect the battery cables as outlined in “General Hazards”.

12.Drain the oil and remove the oil filter. Replace the oil filter according to Section 4.4, “Changing the Oil Filter”. Replace the oil with synthetic oil as recommended in Section 4.3, “Changing the Engine Oil”.

13.Reconnect the battery cables as outlined in “General Hazards” (page 2) and insert the 7.5A and 15A fuses into the generator control panel. The generator is now ready for service.

3.2USING THE AUTO/OFF/MANUAL SWITCH (FIGURE 3.1)

‹3.2.1 “AUTO” POSITION

Selecting this switch position activates fully auto- matic system operation. It also allows personnel to start and exercise the engine every seven days with the setting of the exercise timer (see Section 3.6). This position also is used for remote starting, when it is set up.

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