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Generator control and operation, Operating unit with manual transfer switch, Operating unit with automatic transfer switch – Generac 20kW User Manual

Page 15

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GENERATOR CONTROL AND
OPERATION

Refer to the appropriate control panel operator’s
manual for this unit.

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.

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 posi-
tively turned off, or extremely dangerous - pos-
sibly 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.

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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

generator.

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.

OPERATING UNIT WITH AUTOMATIC
TRANSFER SWITCH

If the generator has been installed with an automatic
transfer switch, such as an RTS, HTS, or GTS-type
transfer switch, the engine may be started and
stopped automatically or manually.

NOTE:

Refer to the applicable manual for your trans-
fer switch and to “Transfer Switch Start Signal
Connections”. In addition, please note the dangers
under “Engine Start-up and Transfer.”

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9-1

Standby Generator Sets

Operation

Oper001 Rev.

0 08/05