Generac 04673-2 Setting the Exercise Timer, ‹ 3.7.1 LOW OIL Pressure Switch, ‹ 3.7.3 Overcrank

Section 3 — Operation

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

DANGER

Do not attempt to activate the transfer switch manually until all power voltage supplies

to the switch have been positively turned off. Failure to turn off all power voltage supplies may result in extremely hazardous and possibly fatal electrical shock.

5.Use the manual transfer handle inside the trans- fer switch to move the main contacts back to their “Utility” position, i.e., loads connected to the util- ity power source (Figure 3.2).

6.Turn ON the utility power supply to the transfer switch using the means provided.

7.Set the system to automatic operation as outlined in “Automatic Transfer Operation,” Section 3.3.

3.6SETTING THE EXERCISE TIMER

The generator is equipped with an exercise timer. Once it is set, the generator will start and exercise once every seven days, on the day of the week and at the time of day the following sequence is completed. During this exercise period, the unit runs for approx- imately 12 minutes and then shuts down. Transfer of loads to the generator output does not occur during the exercise cycle.

A switch on the control panel (see Figure 3.1) allows for selection of the day and time for system exercise. To select the desired day and time of day, the follow- ing sequence must be done at that time.

1.Verify that the AUTO/OFF/MANUAL switch is set to AUTO.

2.Hold down the set timer switch until the genera- tor starts (approximately 10 seconds) and then release.

3.The generator will start and run for approximately 12 minutes and then shut down on its own. The exerciser will then be set to run at that time of day every week.

NOTE:

The exerciser will only work in the AUTO mode and will not work unless this procedure is per- formed. The exerciser will need to be reset every time the 12-volt battery is disconnected and then reconnected. The exerciser WILL NOT work if dip switch 2 (Remote Not Auto) on the controller printed circuit board is ON.

3.7PROTECTION SYSTEMS

‹3.7.1 LOW OIL PRESSURE SWITCH

This switch (Figure 3.3) has normally closed con- tacts that are held open by engine oil pressure during cranking and operating. Should oil pressure drop below the 8 psi range, switch contacts close, and the engine shuts down. The unit should not be restarted until oil is added, and the AUTO/OFF/MANUAL switch must be turned to OFF and then back to AUTO.

‹3.7.2 HIGH TEMPERATURE SWITCH

This switch’s contacts (Figure 3.3) close if the tem- perature should exceed approximately 140º C (284º F), initiating an engine shutdown. The generator will automatically restart and the LED will reset once the temperature has returned to a safe operating level.

Figure 3.3 – Low Oil Pressure and

High Temperature Switches

Low Oil Switch High Temp Switch

Loose n

Oil

Drain

Hose

Oil Filter

‹ 3.7.3 OVERCRANK

This feature prevents the generator from damaging itself when it continually attempts to start and anoth- er problem, such as no fuel supply, prevents it from starting. The unit will crank and rest for a preset time limit. Then, it will stop cranking, and the LED will light indicating an overcrank failure. The AUTO/OFF/ MANUAL switch will need to be set to OFF and then back to AUTO to reset the generator control board.

NOTE:

If the fault is not repaired, the overcrank feature will continue to activate.

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