Kohler 24RCL Manual page 76

Problem Possible Cause
Engine power loss
Generator set overloaded
Low output or
excessive drop
in voltage.
Incorrect controller settings
Incorrect voltage settings
Alternator or control system
Controller
Rotor (open, grounded, or shorted
windings)
Stator (open, grounded, or
shorted windings)
Low engine speed causing
voltage roll-off
No AC output AC circuit breaker tripping
because of short circuit
voltage.
AC circuit breaker tripping
because of overload
Controller settings incorrect
Controller connections
Alternator or control system
Alternator excitation failure
Rotor (open, grounded, or shorted
windings)
Stator (open, grounded, or
shorted windings)
I/M = generator set installation manual; O/M = generator set Operation Manual; S/M = service manual; W/D = wiring diagram.
Note:
Figure 5-4 General Troubleshooting Chart
76 Section 5 Troubleshooting
Corrective Action
Refer to the Engine Service Manual for
troubleshooting and repair instructions.
Reduce the load.
If the system is equipped with a load
management device, troubleshoot the load
management device.
Check system voltage, frequency, and engine
model settings.
Check and adjust the voltage settings and
voltage calibration on the RDC2 controller.
Perform separate excitation procedure to
isolate problem to the alternator or the control
system.
Check the controller settings.
Check the controller wiring and connections.
Test and/or replace.
Test and/or replace.
Check system voltage, frequency and engine
model settings.
Troubleshoot the engine.
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.
Reduce the load on the generator set.
If the system is equipped with a load
management device, troubleshoot the load
management device.
Check and adjust the controller settings.
Check for loose connections. Check the
generator set wiring.
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.
Perform separate excitation procedure from
alternator service manual.
Check voltage and continuity.
Check voltage and continuity.
Reference
Engine S/M
—
Load management
device
documentation
Section 3.6
Sections 3.6, 3.7,
and 6.4
Alternator S/M
Section 3.6
W/D, Section 8
Alternator S/M
Alternator S/M
Section 3.6
Engine S/M
—
—
Load management
device
documentation
Section 3.6
W/D, Section 8
Alternator S/M
Alternator S/M
Alternator S/M
Alternator S/M
TP-6907 5/16