Kohler 12RESM1 Service Manual

TP-6196 10/09 31Section 3 Troubleshooting
Troubleshoot in g Chart, continu ed
Problem ReferenceCorrective ActionPossible Cause
Overheats
Inadequate cooli ng Inspect cooling system for air intake obstructions. Section 2.5
Fuel m ixture adjustment
incorrect
Readjust fuel mixture.
Note: Adjusting the fuel mixture may void the emission
certification.
Section 6.12
Low output
or
excessive
drop in
voltage
Generator overloaded Reduce load. —
Incorrect controller
configuration
Check and adjust the controller configuration parameters. Section 4.5 or
5.5
Incorrect controller
voltage settings
Check and adjust the controller voltage settings. Section 4.5.3 or
5.6
Alternator or control
system
Perform separate excitation procedure to isolate problem to the
alternator or the control system.
Section 6.2
SCR modul e Check wiring and connections to the SCR module.
Check auxiliary winding fuse F1.
Replace SCR module and test voltage.
Section 6.13
Section 6.8
Controller Check controller settings. Check controller fuse, wiring and
connections.
Before replacing controller, replace SCR module and test
voltage.
Section 4.5 or
5.5
Section 6.8
Rotor (open, grounded,
or shorted windings)
Test and/or replace. Section 6.4
Stator (open, grounded,
or shorted windings)
Test and/or replace. Section 6.3
Brush connection Check for loose brush connections.
Check the resistance t hrough the brushes. Resistance through
the brushes should be low, 0.1--0.2 ohms without meter lead
resistance.
Section 6.6
Low engine speed
causing voltage roll-off
Check system voltage/frequency (Uu) and engine type (Ec)
parameters.
Adjust engine governor speed.
Troubleshoot engine.
Section 4.5 or
5.5
Section 6.9 or
6.10
Engine S/M
Light flicker Voltage stability (gain)
setting
Check and adjust the voltage stability (gain) setting using the
controller keypad.
Section 4.5.3
High output
voltage
Incorrect controller
configuration
Check and adjust the controller configuration parameters. Section 4.5 or
5.5
Incorrect controller
voltage settings
Check and adjust the controller voltage settings. Section 4.5.3
Engine speed too high Check engine speed using tachometer or frequency meter.
Adjust governor as necessary.
Section 6.9 or
6.10
Loose voltage sensing
connections
Check connections: stator leads 11 and 44 and P15 controller
connection.
Section 8
SCR modul e Check wiring and connections to the SCR module.
Check auxiliary winding fuse F1 (lead 55).
Replace SCR module and recheck voltage.
Section 6.8
Section 6.13
Section 6.8
Controller Check fuses, wiring and connections. Before replacing
controller, replace SCR module and test voltage.
Section 4.9

Kohler 12RESM1 Specifications

General

Brand	Kohler
Model	12RESM1
Category	Portable Generator
Language	English