GE 15k, Operator'S Manual

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electronic Governor
The engine electronic governor system allows for improved
control and increased generator performance compared
to mechanically governed systems. The result is smooth
steady-state operation without the “hunting” common
to some mechanical governors. The system also reduces
speed variations under engine loading and unloading and
significantly reduces frequency fluctuation experienced
when the engine is under higher loads.
The electronic governor system is composed of a stepper
motor (B) , stepper motor throttle control linkages (C) , and
throttle side linkages (A) . The control board contains a
digital controller that processes engine speed information
and sends appropriate commands to the stepper motor to
control the position of the engine throttle.
Since the electronic governing system controls the engine
throttle demand based upon generator load, the following
service codes and/or conditions may be related to an
electronic governing system issue:
• Engine Does Not Start
• Over Speed
• Under Frequency
• Unstable No Load Engine Control
While trouble shooting any of these conditions, a verification
of the electronic governor system can be initiated through
the control panel – advanced menu options – Electronic
Governor Check. Refer to the Installation Manual for
Advanced Menu Operation.
electronic Governing check:
The generator has an electronic governing check feature
that will turn on the stepper motor and move the throttle
linkage clockwise and counterclockwise within the throttle
limits. The test will rotate the stepper motor and move the
throttle arm between the wide open throttle and dead idle
limits 4 times with a 2 second delay between each throttle
sweep. This will allow visual verification that the stepper
motor is functioning properly and the control linkages are
connected. The engine will not attempt to start during this
test. If the stepper motor does not move, or if a linkage binds,
then service may be required.
NOTICE If stepper motor does not move, please make sure
the stepper motor connector is attached.
a
B c
a
B c