Component Testing and Adjustment 7-1TP-5648 8/93
Section 7. Component Testing
and Adjustment
Thissectionisaguideforcheckinggenerator,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)usinganoutsideDCpowersource
or 12-volt automotive battery and the following
procedures. While separately exciting the generator to
determinethe presence of afaultyvoltageregulator, itis
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.
WARNING
Hazardous voltage.
Do not operate generator set without all guards
and electrical enclosures in place.
Moving rotor.
Can cause severe injury or death.
Hazardous voltage can cause severe injury or
death. Perform electrical service only as prescribed in
equipment manual. Be sure that generator is properly
grounded. Never touch electrical leads or appliances
with wet hands, when standing in water, or on wet
ground as the chance of electrocution is especially
prevalent under such conditions. Wiring should be
inspected at the interval recommended in the service
schedule—replace leads that are frayed or in poor
condition. The function of a generator set is to produce
electricity and wherever electricity is present, there is
the hazard of electrocution.
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