Overcrank Shutdown; Failure To Start; Cranking Conditions - Generac Power Systems 10 kW LP Repair Manual

sEctioN 1.6
ENGiNE-GENErator ProtEctiVE DEVicEs

oVercrank ShutdoWn

This feature prevents the generator from damaging
itself when it continually attempts to start and another
problem, such as no fuel supply, prevents it from start-
ing. The unit will crank and rest for a preset time limit.
Then, it will stop cranking, and the LCD screen or the
LED on the generator control panel will light indicating
an overcrank failure. The AUTO-OFF-MANUAL switch
will need to be set to OFF and then back to AUTO to
reset the generator control board.
note: if the fault is not repaired, the overcrank
feature will continue to activate.
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 electronic 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
1,500 RPM (1,800 RPM for 8 kW units).
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 con-
tinue 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.
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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
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.
GENERAL INFORMATION