TP-6137 5/03 51Section 9 Generator Troubleshooting
Section 9 Generator Troubleshooting
9.1 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
areinplace.
Moving rotor.
WARNING
Handling the capacitor. Hazardous voltage can cause
severe injury or death. Electrical shock results from
touching the charged capacitor terminals. Discharge the
capacitor by shorting the terminals together.
(Capacitor-excited 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 t he 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.
STATOR
ROTOR
RECTIFIER
CAPACITOR
Residual magnetism of the
rotor starts the process
AC Output
Automatic Exciter
Figure 9-1 Alternator and Exciter Diagram
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