Component Testing and Adjustment 7-1TP-5606 6/02
Section 7. Component Testing
and Adjustment
This section is a guide for checking generator, controller,
and some engine components for improper operation.
Follow the safety precautions at the beginning of this
manual during all test procedures. Additional safety
precautions are included with the tests; OBSERVE
THESE PRECAUTIONS!
Separate Excitation
To determine the cause of no AC output, separately
excite the generator. The generator field (rotor) may be
excited (magnetized) using an outside DC power source
or 12-volt automotive battery and the following
procedures. While separately exciting the generator to
determine the presence of a faulty voltage regulator, it is
possible to determine if a running fault exists in the rotor
and/or stator. A generator component appearing good
while static (stationary), may exhibit a running open or
short while dynamic (moving). This fault can be caused
by centrifugal forces acting on the windings while
rotating or insulation breakdown as temperatures
increase.
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
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.
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