Not for
Reproduction
33
A
B
C
INSTALLATION
cont.
NOTICE
If stepper motor does not move, check
that electrical connections are secure
Figure 24
Mixer Assembly
Figure 25
Stepper Motor (In Battery Compartment)
Electronic Governor System
The engine electronic governor system allows for improved
control and increased generator performance compared to
mechanically governed systems. 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. Throttle side linkage
B. Stepper motor
C. Stepper motor throttle control linkages
See Figures 24 and 25.
The control board contains a digital controller that
processes engine speed information and sends
appropriate commands to the stepper motor to control
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.
Service Codes:
• ENGINE DOES NOT START
• ENGINE OVER SPEED
• LOW FREQUENCY
• GENERATOR SENSE FAULT
Fault Conditions:
• Unstable no-load engine control
• Overload or short on generator output
• Throttle linkage malfunction
• Non-functional AVR (Automatic Voltage Regulator)
• Generator sensing wire disconnection
While trouble shooting any of these codes or conditions,
a verification of the electronic governor system can be
initiated through the control panel - Advanced Menu options
- Electronic Governor Check. See
Advanced Settings
Screen
section.
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, service may be
required.
