Manual Transfer Operation; Transfer To Generator Power Source; Transfer Back To Utility Power Source - Generac Power Systems 04758-1, 04759-1, 04760-1 Installation And Owner's Manual

D.Utility Voltage Pickup Sensor
• This sensor monitors utility power supply volt-
age. When that voltage is restored to above 70
percent of the nominal source voltage, a retrans-
fer time delay starts timing.
E.Retransfer Time Delay
• This timer runs for about 15 seconds.
• At end of a 15-second delay, circuit board action
de-energizes the transfer relay in the transfer
switch.
• Retransfer to utility power source then occurs.
F . Engine Cool-down Timer
• When the load is transferred back to utility power
source, the engine cool-down timer starts timing.
• The timer will run for about one minute, and the
generator will then shut down.
3.5

MANUAL TRANSFER OPERATION

3.5.1 TRANSFER TO GENERATOR
POWER SOURCE
To start the generator and activate the transfer switch
manually, proceed as follows:
1. Set the generator's main circuit breaker to its
OFF (or open) position.
2. Set the generator's AUTO/OFF/MANUAL switch
to OFF .
3. Turn OFF the utility power supply to the transfer
switch using the means provided (such as a
utility main line circuit breaker).
DANGER
Do not attempt to activate the transfer switch
manually until all power voltage supplies to
the switch have been positively turned off.
Failure to turn off all power voltage supplies
may result in extremely hazardous and possibly
fatal electrical shock.
4. Use the manual transfer handle inside the trans-
fer switch to move the main contacts to their
"Standby" position, i.e., loads connected to the
standby power source (Figure 3.2).
5. To crank and start the engine, set the AUTO/OFF/
MANUAL switch to MANUAL.
6. Let the engine stabilize and warm up for a few
minutes.
7. Set the generator's main circuit breaker to its ON
(or closed) position. The standby power source
now powers the loads.
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators
Figure 3.2 – Manual Transfer Switch Operation
When utility power has been restored, transfer back
to that source and shut down the generator. This can
be accomplished as follows:
1. Set the generator's main circuit breaker to its
2. Let the engine run for a minute or two at no-load
3. Set the generator's AUTO/OFF/MANUAL switch to
4. Check that utility power supply to the transfer
5. Use the manual transfer handle inside the trans-
6. Turn ON the utility power supply to the transfer
7. Set the system to automatic operation as outlined
Section 3 — Operation
3.5.2 TRANSFER BACK TO UTILITY POWER
SOURCE
OFF (or open) position.
to stabilize the internal temperatures.
its OFF (or open) position. The engine should
shut down.
switch is turned OFF .
DANGER
Do not attempt to activate the transfer switch
manually until all power voltage supplies
to the switch have been positively turned off.
Failure to turn off all power voltage supplies
may result in extremely hazardous and possibly
fatal electrical shock.
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).
switch using the means provided.
in "Automatic Transfer Operation," Section 3.3.
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