Operation
18
Owner’s Manual for 60 Hz Air-Cooled Generators
Transfer to Utility Power Source
When utility power has been restored, transfer to utility
source and shut down the generator. Proceed as follows
to manually transfer to utility power and shut down the
generator:
1.
Set the MLCB (generator disconnect) to OFF
(OPEN).
2.
Run engine for two minutes at no-load to stabilize
the internal temperature.
3.
Press the control panel OFF button. The engine
will shut down.
4.
Verify that utility power supply to the transfer switch
is turned off.
5.
Move the main contacts to the UTILITY position
(loads connected to the utility power source) using
the manual transfer handle (A in
)
inside the transfer switch.
6.
Turn on the utility power supply to the transfer
switch using the means provided.
7.
Press the control panel AUTO button.
8.
Return the MLCB (generator disconnect) to ON
(CLOSED).
Automatic Transfer Operation
Proceed as follows to select automatic operation:
1.
Verify that the transfer switch main contacts are set
to UTILITY (loads connected to the utility power
source).
2.
Verify that normal utility power source voltage is
available to transfer switch terminal lugs N1 and
N2.
3.
Press the AUTO button on the control panel
interface.
4.
Set the MLCB (generator disconnect) to ON
(CLOSED).
The generator will start automatically when utility source
voltage drops below a preset level. Loads are transferred
to the standby power source after the unit starts.
Automatic Sequence of
Operation
Utility Failure
If the generator is set to AUTO, when utility fails (below
65% of nominal) a 5 second (dealer programmable) line
interrupt delay time is started. The engine cranks and
starts if the utility is still gone when the timer expires. An
engine warm-up timer will be initiated once started. Timer
duration varies depending on whether or not Cold Smart
Start is enabled. The controller will transfer the load to
the generator when the warm-up time expires. If the utility
power is restored (above 80% nominal) at any time from
the initiation of the engine start until the generator is
ready to accept load (warm-up time has not elapsed), the
controller completes the start cycle and runs the
generator through its normal cool down cycle. However,
the load will remain on the utility source.
Cranking
The system will control the cyclic cranking as follows:
•
9 kW Unit:
five cranking cycles as follows: 15
seconds cranking, 7 seconds resting, followed by
four additional cycles of 7 seconds cranking
followed by 7 seconds resting.
•
11–22 kW Units:
five cranking cycles as follows:
16 seconds cranking, 7 seconds resting, 16
seconds cranking, 7 seconds resting, followed by
three additional cycles of 7 seconds cranking
followed by 7 seconds resting.
