Generac Power Systems 004812-3, Owner'S Manual

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12
Section 3 – Operation
Standby Generator Sets
3.1 GENERATOR CONTROL AND
OPERATION
Refer to the appropriate control panel operator’s
manual for this unit.
3.2 OPERATING UNIT WITH MANUAL
TRANSFER SWITCH
If the generator was installed in conjunction with a
transfer switch capable of manual operation only, the
following procedure applies. A manually operated
transfer switch is one that will not provide automatic
start-up and does not include an intelligence circuit.
3.2.1 ENGINE START-UP AND TRANSFER
For additional information, refer to the applicable
control panel manual for this unit, as well as any lit-
erature pertaining to the specific transfer switch.
DANGER

The MAINTENANCE DISCONNECT switch and the
AUTO/OFF/MANUAL switches (if so equipped)
must be set properly, or the generator will crank
and start as soon as the utility power to the
transfer switch is turned off. Refer to applicable
control panel and transfer switch manuals for
more information.

Do not proceed until certain that UTILITY source
voltage is available to the transfer switch and
the transfer switch main contacts are set to
UTILITY.

Do not attempt manual operation until all
power supplies to the transfer switch have been
positively turned off, or extremely dangerous
— possibly lethal — electrical shock
will result.

Transfer switch enclosure doors should be kept
closed and locked. Only authorized personnel
should be allowed access to the transfer switch
interior. Extremely high and dangerous voltages
are present in the transfer switch.
In order to transfer load from the utility source to the
generator, follow these directions:
• Turn OFF or disconnect the UTILITY power circuit
to the transfer switch, using the means provided
(such as the utility source main line circuit break-
er).
• Set the transfer handle to its UTILITY (NORMAL)
position with load circuits connected to the utility
power supply.
• Set the standby generator’s main line circuit break-
er to its OFF (or OPEN) position.
• Start the generator.
‹

Do not crank the engine continuously for longer
than 30 seconds, or the heat may
damage the starter motor.
• Let engine stabilize and warm up.
• Check all applicable instrument and gauge read-
ings. When certain that all readings are correct,
move the transfer switch manual handle to its
STANDBY (GENERATOR) position, i.e., load cir-
cuits supplied by the generator.
• Set the standby generator’s main line circuit break-
er to its ON (or closed) position.
• Load circuits are now powered by the standby gen-
erator.
3.2.2 RETRANSFER AND SHUTDOWN
For additional information, refer to the applicable
control panel manual for this unit, as well as any lit-
erature pertaining to the specific transfer switch.
To transfer the load back to the utility power source
and shut down the generator, follow these direc-
tions:
• Set the standby generator’s main line circuit break-
er to its OFF (or OPEN) position.
• Manually move the transfer switch handle to its
UTILITY (NORMAL) position, i.e., load circuits
connected to the utility.
• Turn ON the utility power supply to the transfer
switch, using the means provided (such as the util-
ity power source main line circuit breaker).
• Let the generator run at no-load for a few minutes
to stabilize internal temperatures.
• Shut down the generator.
3.3 OPERATING UNIT WITH
AUTOMATIC TRANSFER SWITCH
If the generator has been installed along with an auto-
matic transfer switch, such as a GTS-type switch, the
engine may be started and stopped automatically or
manually.
NOTE:
Refer to the applicable manual for the trans-
fer switch and to “Transfer Switch Start Signal
Connections” (Section 2.7). In addition, please
note the dangers under “Engine Start-up and
Transfer.”
‹