Generac Power Systems 04389-3, 04456-3, 04390-3 Setting The Exercise Timer, Protection Systems

Section 3 — Operation

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

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.

‹3.7.2 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 on the generator control panel will reset once the temperature has returned to a safe operating level.

3.6SETTING THE EXERCISE TIMER

This 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) per- mits selection of the day and time for the system to exercise. At the chosen time, perform the following sequence to select the desired day and time of day the system will exercise.

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

2.Hold down the “Set Exercise Time” switch until the generator starts (approximately 10 seconds) and then release.

3.The generator will start and run for approximate- ly 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 on the controller printed circuit board (Remote Not Auto) 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 dur- ing 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. The AUTO/OFF/MANUAL switch must then be turned to OFF and then back to AUTO.

Figure 3.3 – Low Oil Pressure and

High Temperature Switches

Low Oil Switch High Temp Switch

Loosen

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 on the generator control panel 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.

3.7.3.1 Approximate Crank Cycle Times

•15 seconds ON

•7 seconds OFF

•7 seconds ON

•7 seconds OFF

•Repeat for 45 seconds Approximately 90 seconds total

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