Kohler 17RES Manual page 32

Problem Possible Cause
Alternator or control
No output
system
voltage,
continued
SCR module
Controller
Open wiring,
terminal, or pin in
buildup circuit or
SCR module circuit
Brushes
Rotor slip rings dirty
or corroded
Rotor (open,
grounded, or
shorted windings)
Stator (open,
grounded, or
shorted windings)
Flash relay (K3) on
controller
Aux. winding fuse
blown (lead 55)
* 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
32 Section 3 Troubleshooting
Test
Perform separate excitation
procedure to isolate the problem
to the alternator or the control
system.
Check auxiliary winding fuse F1
(lead 55).
Replace SCR module and test
voltage.
Check the controller settings.
Test the controller as described in
Section 3.4.
Check fuses and wiring.
Inspect brushes.
Check for brushes sticking in
brush holder or broken brush
spring.
Check that brush holder is
securely mounted.
Check slip ring condition.
Check voltage and continuity as
described in Section 5.4.
Check voltage and continuity as
described in Section 5.3.
Check fuse F2.
Check flash LED 1 on controller.
Check fuse.
If fuse blows again, check stator.
S/S = Generator Set Specification Sheet
Engine S/M = Engine Service Manual
Corrective Action
Troubleshoot the alternator or
control system components as
described below and elsewhere in
this table.
Check auxiliary winding fuse F1
(lead 55).
Replace SCR module and test
voltage.
Adjust controller settings.
See Section 3.4.
Replace fuses or wiring as
necessary.
Replace brushes if worn.
Replace brush spring or brush
assembly.
Tighten brush holder screws.
Clean slip rings as described in
Section 5.5. Machine slip rings if
necessary.
Repair or replace rotor if indicated
by the tests.
Repair or replace the stator if
indicated by the test results.
Replace fuse F2.
If LED1 indicates power to the
relay but the relay does not
operate, replace controller board.
Replace blown fuse.
If fuse blows again, check stator.
O/M = Generator Set Operation Manual
Reference
Section 5.2
Section 5.13.2
Section 4.8
Section 4.5
Section 3.4
Section 5.13.2
Section 7 W/D
Section 5.6
Section 5.6
Section 5.6
Section 5.5
Section 5.4
Section 5.3
Section 5.13.2
Section 4.6
Section 5.13.2
Section 5.3
TP-6519 8/17