Kohler 14RES Manual page 34

Problem Possible Cause
Generator
Low output
overloaded
or
excessive
Incorrect controller
drop in
configuration
voltage
Incorrect controller
voltage settings
Alternator or control
system
Controller
Rotor
Stator
Brush connection
Low engine speed
causing voltage
roll-off
W/D = Wiring Diagram(s) (Section 7)
I/M = Generator Set Installation Manual
* RDC controller settings can be checked and adjusted using the controller user interface or using a personal computer running SiteTech
software. DC controller settings can only be changed using SiteTech.
34 Section 3 Troubleshooting
Test
Reduce electrical load and check
operation.
Check the controller configuration
parameters. *
Check the controller voltage
settings. *
Perform separate excitation
procedure to isolate problem to
the alternator or the control
system.
Check the controller settings.
Test the controller as described in
Section 3.6.
Test rotor for open, grounded, or
shorted windings.
Test stator for open, grounded, or
shorted windings.
Check for loose brush
connections.
Check for loose brush mounting.
Check the resistance through the
brushes. Resistance through the
brushes should be low, 0.1--0.2
ohms without meter lead
resistance.
Check system voltage/frequency
(Uu) and engine type (Ec)
parameters. *
Check engine speed.
Engine problem.
S/S = Generator Set Specification Sheet
Engine S/M = Engine Service Manual
Corrective Action
Unplug some lights or appliances
connected to the generator set.
Adjust the controller configuration
parameters. *
Adjust the controller voltage
settings. *
Troubleshoot the alternator or
control system as indicated by
test results.
Adjust controller settings.
See Section 3.6.
Replace rotor if faulty windings
are found.
Replace stator if faulty windings
are found.
Tighten loose brush connections.
Tighten mounting screws.
Replace brushes if they show
uneven wear or are worn to
one-half their original length.
Change system voltage/frequency
(Uu) and engine type (Ec)
parameters if not correct. *
Adjust engine speed.
Troubleshoot the engine.
O/M = Generator Set Operation Manual
Reference
—
Section 4.10
Section 4.10.4
Section 5.2
Section 4.10
Section 3.6
Section 5.4
Section 5.3
Section 5.6
Section 4.10.1
Section 4.10.4
Engine S/M
TP-6735 7/17