Section 4 — Maintenance
Guardian
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 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 performed. The exerciser will need to be reset every time the
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 over- crank 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
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. The Auto/Off/Manual switch must then 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. Your generator will automatically restart and the LED on the generator control panel 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 |
Loosen
Oil
Drain
Hose
•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 your nearest Generac/Guardian Authorized Dealer if this failure occurs.
4.1FUSE
The generator panel’s 15 amp fuse (Figure 4.1) protects the DC control circuit against overload. The fuse is wired in series with the battery output lead to the panel. If the fuse element has melted open, you cannot crank or start the engine. You should replace the fuse using only an identical
The generator panel’s 5 amp fuse protects the battery charge circuit against overload. If the fuse element has melted open, you will not have battery charging capa- bility. You should replace the fuse using only an identi- cal 5 amp replacement. To remove fuse, push cap down and rotate counterclockwise.
Oil Filter
16 Generac® Power Systems, Inc.
