Installation Guide
30
steady-state operation without the “hunting” common to
many 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 linkage (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 on generator load, the following
service codes and/or conditions can be related to an
electronic governing system issue:
• Engine Does Not Start
• Over Speed
• Under Frequency
• Unstable No Load Engine Control
While troubleshooting any of these conditions, a verification
of the electronic governor system can be initiated through the
control panel – Actuator Test.
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 for up to
10 seconds. This will allow visual verification that the stepper
motor is functioning correctly 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 willbe required.
Not for
Reproduction