3. Refer to the above diagram. Connect the rheostat.
Adjust the rheostat to the maximum resistance
value. Connect the external power source to wires
“F1+” and “F2-” .
4. Start the generator set. Run the generator set at
IDLE speed.
5. Monitor the phase current. Gradually increase the
engine RPM. Increase the engine RPM until one
of the following conditions are met:
• The rated phase current is obtained.
• The full generator set speed is obtained.
6. If more phase current is still necessary, slowly turn
the rheostat until the rated phase current is
reached.
7. On an hourly basis, stop the drying procedure.
Check the insulation resistance. Repeat the above
steps until the insulation resistance is acceptable.
i05728320
Generator - Inspect
SMCS Code: 4450-040
Personal injury or death can result from improper
troubleshooting and repair procedures.
The following troubleshooting and repair proce-
dures should only be performed by qualified per-
sonnel familiar with this equipment.
Refer to Safety Section, “Generator Isolating for
Maintenance” for information regarding the
procedure to isolate the generator safely.
Proper maintenance of electrical equipment requires
periodic visual examination of the generator and
periodic visual examination of the windings. Proper
maintenance of electrical equipment also requires
appropriate electrical checks and appropriate thermal
checks. Insulation material should be examined for
cracks. The insulation material should be examined
for accumulations of dirt and dust. If there is an
insulation resistance value that is below normal, a
conductive path may be present. This conductive
path may be made of one of the following materials:
• Carbon
• Salt
• Metal dust
• Dirt that is saturated with moisture
These contaminants will develop a conductive path
which may produce shorts. Cleaning is advisable if
heavy accumulations of dirt can be seen or if heavy
accumulations of dust can be seen. If excess dirt is
the cause of a restriction in the ventilation, cleaning is
also advisable. Restricted ventilation will cause
excessive heating.
NOTICE
To avoid the possibility of deterioration to the genera-
tor windings, do not clean the generator unless there
is visual, electrical, or thermal evidence that dirt is
present.
If harmful dirt accumulations are present, various
cleaning techniques are available. The cleaning
procedure that is used may be determined by one of
the items on the following list:
• The extent of the cleaning procedure that is being
attempted
• The type of enclosure of the generator
• The voltage rating of the generator
• The type of dirt that is being removed
Cleaning (Assembled Generators)
Cleaning may be required at the point of installation.
If complete disassembly of the generator is not
necessary or feasible, a vacuum cleaner should be
used to pick up the following items: dry dirt, dust and
carbon. Vacuuming dust and dirt will prevent the
spreading of these contaminants.
If necessary, connect a small nonconductive tube to
the vacuum cleaner. A nonconductive tube will allow
the vacuum cleaner to clean the surfaces that are not
exposed. After most of the dust has been removed, a
small brush may be attached to the vacuum hose in
order to loosen firmer dirt.
134
SEBU7125-13
Maintenance Section
Generator - Inspect
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