Generac
®
Power Systems, Inc.
15
Section 3 — Operation
Generac Liquid-cooled 20 kW Generator
NOTE:
This fuse will not remove the + battery input
power from the PCB when it opens. This means
the exercise timer will not be reset. If this fuse
does open, carefully check the wiring to the start,
fuel, field boost and transfer outputs before
replacing the fuse.
3.1.11 SET EXERCISE TIME SWITCH
This switch allows to program the generator to start
and exercise automatically. “See Weekly Exercise
Cycle.”
3.2
MANUAL TRANSFER AND
START-UP
To transfer electrical loads to the “Standby” (genera-
tor) power source side and start the engine manually,
refer to the Owner’s Manual of the particular transfer
switch.
3.3
RETRANSFER AND SHUTDOWN
When UTILITY power source voltage has been
restored, electrical LOADS may be transferred back
to that source and the generator can be shut down as
follows:
• Verify that UTILITY power supply voltage to the
transfer switch has been positively turned OFF,
using whatever means provided (such as utility
main line circuit breaker).
• Set the generator’s main circuit breaker to its OFF
or OPEN position.
• Let the generator engine run at no-load for a few
minutes, to stabilize internal unit temperatures.
• On the generator console, set the AUTO/OFF/
MANUAL switch to OFF. Wait for engine to come to
a complete stop.
• For transfer to UTILITY position, refer to the
Owner’s Manual of the particular transfer switch.
• Turn on the UTILITY power supply to the transfer
switch, using whatever means provided (such as a
utility main line circuit breaker). The UTILITY
power source now powers the loads.
3.4
AUTOMATIC OPERATION
To set the system for fully automatic operation, pro-
ceed as follows:
• Check that LOAD circuits are connected to the
UTILITY power supply.
• Set the AUTO/OFF/MANUAL switch to its AUTO
position.
• Set the generator main circuit breaker to its ON or
CLOSED position.
3.5
WEEKLY EXERCISE CYCLE
The generator will start and exercise once every seven
days. During this weekly exercise, the unit runs for
about 20 minutes and shuts down. Transfer of
LOADS to generator output does not occur during the
exercise.
To select day and time for exercising, proceed as
follows:
• Set the AUTO/OFF/MANUAL switch to OFF.
• Set generator main circuit breaker to OFF or
OPEN.
• Locate the rocker switch on the control panel iden-
tified with the words “Set Exercise Time” (Figure
3.2).
• Push “Set Exercise Time” switch to ON position for
20 to 30 seconds and then release. Switch will
spring back into its original position when
released.
• Wait 30 seconds before setting the AUTO/OFF/
MANUAL switch to “AUTO” position.
If AUTO/OFF/MANUAL switch is switched too
soon, the engine may start. If engine does
start, it will shut down automatically in about
two (2) minutes.
• Set the generator main circuit breaker to its ON or
CLOSED position.
• Generator is now programmed to start and exer-
cise every seven days thereafter, on day and time of
day the switch was actuated.
• Place a sign on the generator control panel and the
transfer switch, indicating the day and time the
generator will be exercising.
NOTE:
If battery terminals are disconnected or control
panel fuse is removed, the exercise timer needs to
be reset for correct automatic exercise operation.
Figure 3.2 - “Set Exercise” Switch
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