Kohler 7-9EFKOZD Service Manual

TP-6774 2/14a40 Section 6 Troubleshooting
Problem ReferenceCorrective ActionPossible Cause
Low output
or
excessive
drop in
voltage
Generator overloaded Reduce load. —
Incorrect controller configuration Check and adjust the controller configuration settings. Section 7.13
Incorrect controller voltage
settings
Check and adjust the controller voltage settings. Section 8.10
Alternator or control system Perform separate excitation procedure to isolate
problem to the alternator or the control system.
Section 8.2
Intermittent wiring connection or
lack of compression
Check the harness connections. Check the P2 plug and
F1 fuse connections.
Section 8.15
Section 10
Controller Check the controller settings. Check the controller fuse,
wiring and connections.
Section 7.13
Section 10
Rotor (open, grounded, or
shorted windings)
Test and/or replace. Section 8.8
Stator (open, grounded, or
shorted windings)
Test and/or replace. Section 8.9
Brush connection
(6EKOD/5EFKOD models)
Check for loose brush connections.
Check the resistance through the brushes. Resistance
through the brushes should be low, 0.1--0.2 ohms
without meter lead resistance.
Section 8.6
Low engine speed causing
voltage roll-off
Check the system voltage/frequency settings.
Adjust the engine governor speed.
Troubleshoot the engine.
Section 8.10
Section 4.4
Engine S/M
Light
flicker
Voltage stability (gain) setting Check and adjust the voltage stability (gain) setting
using the ADC IId.
Section 8.10
High
output
voltage
Incorrect controller configuration Check and adjust the controller configuration settings. Section 7.13
Incorrect controller voltage
settings
Check and adjust the controller voltage settings. Section 8.10
Engine speed too high Check the engine speed using tachometer or frequency
meter. Adjust the governor as necessary.
Section 4.4
Loose voltage sensing
connections
Check connections: stator leads 11 and 44 (for 1-phase
models) or leads V7, V8, and V9 (for 3-phase models)
and P2 controller connection.
Section 8.9
Section 10
Controller Check fuses, wiring and connections. Section 7
Section 10

Kohler 7-9EFKOZD Specifications

General

Brand	Kohler
Model	7-9EFKOZD
Category	Marine Equipment
Language	English