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Electronic Governor System
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 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 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.
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
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