Kohler 10EOZ, Manual

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TP-6053 7/04 33 Section 7 Generator Troubleshooting
Section 7 Generator Troubleshooting
7.1 General
Before beginning the following troubleshooting
procedures, read all the safety precautions at the
beginning of this manual. The following tests include
additional safety precautions; OBSERVE THESE
PRECAUTIONS!
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
Moving rotor.
WARNING
Testing the voltage regulator. Hazardous voltage can
cause severe injury or death.
High voltage is present at the
voltage regulator heat sink. To prevent electrical shock do not
touch the voltage regulator heat sink when testing the voltage
regulator.
(PowerBoost
t
, PowerBoost
t
III, and PowerBoost
t
V
voltage regulator models only)
Grounding electrical equipment. Hazardous voltage can
cause severe injury or death.
Electrocution is possible
whenever electricity is present. Open the main circuit
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 . Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
7.2 General Troubleshooting
To determine the cause of no- or low-AC output , refer to
the following steps and the troubleshooting flow chart
(Figure 7-1).
General Troubleshooting Procedure
1. Check the condition of the voltage regulator’s
8-amp fuse.
2. If the fuse is functional, separately excite the
generator. (See Section 7.3.) The separate
excitation test duplicates the role of the voltage
regulator by providing excitation current to the
rotor.
Generator has no
output
Separately
excite generator
Test rotor
Test the exciter circuit
and rectifier module
Generator has
no output
Test voltage
regulator and wiring
Test stator
TP-598651
Generator has
output
Figure 7-1 General Troubleshooting