Kohler 27EFOZ, Service Manual

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TP-5936 7/04 27 Section 7 Generator Troubleshooting
Section 7 Generator Troubleshooting
7.1 General
Before beginning the 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
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.
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).
1. Check the condition of the voltage regulator 8-amp
fuse.
2. If the fuse is good, separately excite the generator.
(See Section 7.3) The separate excitation test
duplicates the role of the voltage regulator in
providing the excitation current to the rotor.
Generator has no
output
Separately
excite
generator
Test rotor
Test voltage
regulator &
wiring
Generator has no
output
Generator has
output
Test stator
TP-593651
Exciter circuit &
rectifier module
Figure 7-1 General Troubleshooting