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3.3
SEQUENCE OF AUTOMATIC
OPERATION
3.3.1 UTILITY FAILURE
Initial Conditions: Generator in Auto, ready to run,
load being supplied by utility source. When utility
fails (below 65% of nominal), a 10 second (optionally
programmable on the 17 and 20kW only) line inter-
rupt delay time is started. If the utility is still gone
when the timer expires, the engine will crank and
start. Once started, a five (5) second engine warm-
up timer will be initiated. When the warm-up timer
expires, the control will transfer the load to the gen-
erator. If the utility power is restored (above 75% of
nominal) at any time from the initiation of the engine
start until the generator is ready to accept load (5
second warm-up time has not elapsed), the control-
ler will complete the start cycle and run the genera-
tor through its normal cool down cycle; however, the
load will remain on the utility source.
3.3.2 CRANKING
The system will control the cyclic cranking as follows:
16 second crank, seven (7) second rest, 16 second
crank, seven (7) second rest followed by three (3)
additional cycles of seven (7) second cranks followed
by seven (7) second rests.
Choke Operation
1. The 990/999cc engines have an electric choke in
the air box that is automatically controlled by the
electronic control board.
2. The 530cc engines have an electric choke on the
divider panel air inlet hose that is automatically
controlled by the electronic control board.
3. The 410cc engines have a choke behind the air
box that is automatically controlled by the elec-
tronic control board.
Failure to Start
This is defined as any of the following occurrences
during cranking.
1. Not reaching starter dropout within the specified
crank cycle. Starter dropout is defined as four (4)
cycles at 1,000 RPM.
2. Reaching starter dropout, but then not reaching
2200 RPM within 15 seconds. In this case the
control board will go into a rest cycle for seven
(7) seconds, then continue the rest of the crank
cycle.
During a rest cycle the start and fuel outputs are
de-energized and the magneto output is shorted to
ground.
18
Section 3 — Operation
Air-cooled Generators
Cranking Conditions
The following notes apply during cranking cycle.
1. Starter motor will not engage within five (5) sec-
onds of the engine shutting down.
2. The fuel output will not be energized with the
starter.
3. The starter and magneto outputs will be ener-
gized together.
4. Once the starter is energized the control board
will begin looking for engine rotation. If it does
not see an RPM signal within three (3) seconds
it will shut down and latch out on RPM sensor
loss.
5. Once the control board sees an RPM signal it will
energize the fuel solenoid, drive the throttle open
and continue the crank sequence.
6. Starter motor will disengage when speed reaches
starter dropout.
7. If the generator does not reach 2200 RPM within
15 seconds, re-crank cycle will occur.
8. If engine stops turning between starter dropout
and 2200 RPM, the board will go into a rest cycle
for seven (7) seconds then re-crank (if additional
crank cycles exist).
9. Once started, the generator will wait for a hold-
off period before starting to monitor oil pressure
and oil temperature (refer to the Alarm Messages
section for hold-off times).
10. During Manual start cranking, if the Mode switch
is moved from the Manual position, the cranking
stops immediately.
11. During Auto mode cranking, if the Utility returns,
the cranking cycle does NOT abort but continues
until complete. Once the engine starts, it will run
for one (1) minute, then shut down.
3.3.3 LOAD TRANSFER
The transfer of load when the generator is running is
dependent upon the operating mode as follows:
1. Manual
•
Will not transfer to generator if utility is present.
•
Will transfer to generator if utility fails (below
65% of nominal for 10 consecutive seconds.
•
Will transfer back when utility returns for 15 con-
secutive seconds. The engine will continue to run
until removed from the Manual mode.
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