Governor System Operation Test - Kohler 6VSG Service Manual

5.6.4

Governor System Operation Test

If the engine continues to operate erratically after the
previous checks, test the governor system operation
using the following procedure.
summarized in the flowchart in Figure 5-14.
Figure 5-14
Check that the
carburetor throttle
linkage is connected to
the stepper motor as
shown in Figure 5-13.
Check for broken or
loose wiring or
connections and other
items in step 2.
Check stepper motor
operation at startup.
Verify that the throttle
opens completely while
cranking, and then partially
closes after the engine
reaches operating speed.
Check the stepper
motor connections
to the controller.
Check the stepper
motor coils.
See steps 8
through 10.
Check the linkage
to the carburetor.
See steps 11
and 12.
Troubleshoot the
controller.
See step 13.
Figure 5-14 Governor System Operation Test
Procedure Summary
TP-6844 1/13
The procedure is
KPS_084
Governor System Operation Test Procedure
1. Verify that the carburetor throttle linkage is
connected to the stepper motor as shown in
Figure 5-13.
2. Look for broken or loose wiring or plug
connections if the
erratically. Check the condition of the throttle
linkage, and verify that the throttle plate closes
completely.
Check the operation of the stepper motor
at startup.
3. Before starting the generator, move the throttle to
the fully closed position. Press the RUN button to
initiate the start sequence.
4. If the throttle stays in the fully closed position, and
the controller shows a Locked Rotor fault, verify
that the generator set model is set to 6VSG.
Then check and verify the alternator connections,
functionality, and operation.
diagrams and Sections 5.2 through 5.5 of this
document.
5. If the throttle moves to the fully open position and
remains fully open, and the controller shuts down
the generator for an overspeed or overfrequency
fault, verify that the generator set model is set to
6VSG. Then check the throttle linkage and
stepper motor connections and operation. Go to
step 8 of this procedure.
6. If the throttle moves to the fully open position and
remains fully open, the engine goes to a high
speed condition, and the controller does not shut
down the generator, verify that the generator set
model is set to 6VSG. Then check and verify the
alternator connections,
operation. See the wiring diagrams and Sections
5.2 through 5.7 of this document.
7. If the throttle moves to the fully open position and
then moves toward the closed position, but the
engine speed is erratic or behaves poorly, check
the throttle linkage
connections and operation. See stepper motor
troubleshooting starting with step 8 of this
procedure. Also check that the engine speed
control parameters are set to the default settings
(Engine Speed Governor and Advanced Speed
Control parameters in SiteTech).
Section 5 Component Testing and Adjustment
stepper motor moves
See the wiring
functionality, and
and stepper motor
73