Electronic Governor - Rheem GEN20AD-E Operator's Manual

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:
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.
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