Kohler 38RCLB

TP-6907 5/1676 Section 5 Troubleshooting
Reference
Corrective ActionPossible CauseProblem
Engine power loss Refer to the Engine Service Manual for
troubleshooting and repair instructions.
Engine S/M
Low output or
excessive drop
in voltage.
Generator set overloaded Reduce the load.
If the system is equipped with a load
management device, troubleshoot the load
management device.
—
Load management
device
documentation
Incorrect controller settings Check system voltage, frequency, and engine
model settings.
Section 3.6
Incorrect voltage settings Check and adjust the voltage settings and
voltage calibration on the RDC2 controller.
Sections 3.6, 3.7,
and 6.4
Alternator or control system Perform separate excitation procedure to
isolate problem to the alternator or the control
system.
Alternator S/M
Controller Check the controller settings.
Check the controller wiring and connections.
Section 3.6
W/D, Section 8
Rotor (open, grounded, or shorted
windings)
Test and/or replace. Alternator S/M
Stator (open, grounded, or
shorted windings)
Test and/or replace. Alternator S/M
Low engine speed causing
voltage roll-off
Check system voltage, frequency and engine
model settings.
Troubleshoot the engine.
Section 3.6
Engine S/M
No AC output
voltage.
AC circuit breaker tripping
because of short circuit
Check for AC voltage on the generator side of
the circuit breaker. If there is AC voltage on the
generator side of the breaker, then a problem in
the load circuits is causing the line circuit
breaker to trip. Check for and correct short
circuits or overloading on the load side before
resetting the circuit breaker.
—
AC circuit breaker tripping
because of overload
Reduce the load on the generator set.
If the system is equipped with a load
management device, troubleshoot the load
management device.
—
Load management
device
documentation
Controller settings incorrect Check and adjust the controller settings. Section 3.6
Controller connections Check for loose connections. Check the
generator set wiring.
W/D, Section 8
Alternator or control system Perform separate excitation procedure to
isolate the problem to the alternator or the
control system. Then troubleshoot the
alternator or control system components as
follows.
Alternator S/M
Alternator excitation failure Perform separate excitation procedure from
alternator service manual.
Alternator S/M
Rotor (open, grounded, or shorted
windings)
Check voltage and continuity. Alternator S/M
Stator (open, grounded, or
shorted windings)
Check voltage and continuity. Alternator S/M
Note: I/M = generator set installation manual; O/M = generator set Operation Manual; S/M = service manual; W/D = wiring diagram.
Figure 5-4 General Troubleshooting Chart