Section 9 Generator Troubleshooting; General - Kohler 4EOZ Service

9.1 General

Before beginning the
procedures, read all the safety precautions at the
beginning of this manual. The following tests include
additional safety precautions; OBSERVE THESE
PRECAUTIONS!
WARNING
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
Handling the capacitor. Hazardous voltage can cause
severe injury or death.
touching the charged capacitor terminals. Discharge the
capacitor by shorting the terminals together.
(Capacitor-excited models only)
STATOR
Residual magnetism of the
rotor starts the process
ROTOR
Figure 9-1 Alternator and Exciter Diagram
TP-6137 5/03

Section 9 Generator Troubleshooting

following troubleshooting
Moving rotor.
Electrical shock results from
RECTIFIER
Grounding electrical equipment. Hazardous voltage can
cause severe injury or death. Electrocution is possible
whenever electricity is present.
breakers of all power sources before servicing the equipment.
Configure the installation to electrically ground the generator
set, transfer switch, and related equipment and electrical
circuits to comply with applicable codes and standards. Never
contact electrical leads or appliances when standing in water
or on wet ground because these conditions increase the risk of
electrocution.
High voltage test. Hazardous voltage can cause severe
injury or death. Follow the instructions of the test equipment
manufacturer when performing high-voltage tests on the rotor
or stator. An improper test procedure can damage equipment
or lead to generator set failure.
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage.
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
AC Output
CAPACITOR
Automatic Exciter
Section 9 Generator Troubleshooting
Open the main circuit
Do not contact electrical
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