Generac Power Systems 04389-3 - Manual (Page 19)

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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.
3.6 SETTING 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.
3.7 PROTECTION 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.
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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.
Figure 3.3 – Low Oil Pressure and
High Temperature Switches
Oil Filter
Oil
Drain
Hose
Low Oil Switch High Temp Switch
Loose
n
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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