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Operation
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.
Failure to Start
This is defined as any of the following occurrences during crank-
ing:
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.
Cranking Conditions
The following notes apply during cranking cycle.
1.
Starter motor will not engage within five (5) seconds of the
engine shutting down.
2.
The fuel output will not be energized with the starter.
3.
The starter and magneto outputs will be energized together.
4.
Once the starter is energized the control board will begin look-
ing 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.
16
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 consecutive
seconds. The engine will continue to run until removed from
the Manual mode.
2.
Auto
• Will start and run if Utility fails for 10 consecutive seconds.
• Will start a five (5) second engine warm-up timer.
• Will not transfer if utility subsequently returns.
• Will transfer to generator if utility is still not present.
• Will transfer back to utility once utility returns (above 75% of
nominal) for 15 seconds.
• Will transfer back to utility if the generator is shut down for
any reason (such as the switch is in the OFF position or a
shutdown alarm.
• After transfer, will shut down engine after one (1) minute
cool-down time.
3.
Exercise
• Will not exercise if generator is already running in either Auto
or Manual mode.
• During exercise, the controller will only transfer if utility fails
during exercise for 10 seconds, and will switch to Auto
mode.
3.3.4
UTILITY RESTORED
Initial Condition: Generator supplying power to customer load.
When the utility returns (above 80% of nominal), a 15 second
return to utility timer will start. At the completion of this timer, if
the utility supply is still present and acceptable, the control will
transfer the load back to the utility and run the engine through a
one (1) minute cool down period and then shut down. If utility fails
for three (3) seconds during this cool down period, the control
will transfer load back to the generator and continue to run while
monitoring for utility to return.
3.4
MANUAL TRANSFER
OPERATION
3.4.1
TRANSFER TO GENERATOR POWER SOURCE
To start the generator and activate the transfer switch manually,
proceed as follows:
1.
Set the generator's AUTO/OFF/MANUAL switch to OFF.
2.
Set the generator's main circuit breaker to its OFF (or OPEN)
position.
3.
Turn OFF the utility power supply to the transfer switch
using the means provided (such as a utility main line circuit
breaker).
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