Section 3 — Operation
Guardian
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) permits selection of the day and time for system exercise. To select the desired day and time of day, the following sequence must be performed 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
3.7PROTECTION SYSTEMS
3.7.1 LOW OIL PRESSURE SWITCH
This switch (Figure 3.3) has normally closed contacts that are held open by engine oil pressure during crank- ing 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 |
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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 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
3.7.4 OVERSPEED
This feature protects the generator from damage by shutting it down if it happens to run faster than the preset limit. This protection also prevents the gener- ator from supplying an output that could potentially damage appliances connected to the generator cir- cuit. Contact the nearest Generac Authorized Dealer if this failure occurs.
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