Kohler 17RES Manual page 31

Problem Possible Cause
Engine not running
Lacks
at rated rpm
power,
continued
Engine power loss
Governor
malfunction or
misadjustment
Ignition system
Generator
Low output
overloaded
or
excessive
Incorrect controller
drop in
configuration
voltage
Incorrect controller
voltage settings
Alternator or control
system
SCR module
Controller
Rotor
Stator
Brush connection
Low engine speed
causing voltage
roll-off
No output AC output circuit
voltage breaker open
* ADC-RES controller only. The DC-RET controller settings cannot be adjusted in the field.
W/D = Wiring Diagram(s) (Section 7)
I/M = Generator Set Installation Manual
TP-6519 8/17
Test
Check controller settings for unit
configuration (UC) and engine
type (EC). *
Check engine speed.
Refer to the engine service
manual for troubleshooting and
repair instructions.
Test governor.
See the engine service manual for
service procedures.
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 wiring and connections to
the SCR module.
Check auxiliary winding fuse F1
(lead 55).
Replace SCR module and
recheck voltage.
Check the controller settings.
Test the controller as described in
Section 3.4.
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.
Check for AC voltage on the
generator side of 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.
S/S = Generator Set Specification Sheet
Engine S/M = Engine Service Manual
Corrective Action
Reset controller settings for unit
configuration (UC) and engine
type (EC). *
Adjust engine speed.
Refer to the engine service
manual for troubleshooting and
repair instructions.
Adjust governor.
See the engine service manual for
service procedures.
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.
Tighten connections and/or
replace wiring as required.
Replace auxiliary winding fuse F1
(lead 55).
Replace SCR module and
recheck voltage.
Adjust controller settings.
See Section 3.4.
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.
Check for and correct short
circuits or overloading on the load
side before resetting the circuit
breaker.
O/M = Generator Set Operation Manual
Section 3 Troubleshooting
Reference
Section 4.5
Engine S/M
Section 5.9
Engine S/M
—
Section 4.5
Section 4.5.4
Section 5.2
Section 7
Section 5.13.2
Section 4.8
Section 4.5
Section 3.4
Section 5.4
Section 5.3
Section 5.6
Section 4.5.1
Section 4.5.4
Engine S/M
—
31