TROUBLESHOOTING PROCEDURES
This section is intended
to
suggest a systematic approach to locating and correcting generator
malfunctions. The section is arranged according to the symptoms
of
the problem. The steps have
been arranged in an attempt to,
1,
do the easy checks first,
2.
prevent further damage when
troubleshooting a disabled machine.
The first and perhaps most important step
of
troubleshooting should to be to gather as much first
hand information as
is
possible from operating personnel
or
people who may have been present at the
onset
of
the trouble
or
failure. Information as to how long the unit had been operating, what loads
were on line, weather conditions, which,
if
any, protective equipment
or
devices functioned,
or
failed
to function, etc. can help
to
isolate the problem.
Always make a thorough visual inspection to check for any obvious problems before attempting
to
run the generator.
WARNING
HIGH
VOLTAGES
MAY
BE
PRESENT
AT
THE
GENERATOR
TERMINALS
WHEN
THE
UNIT IS
RUNNING
.•
TOOLS,
EQUIPMENT
CLOTHING
AND
YOUR
BODY
MUST
BE
KEPT
CLEAR
OF
ROTATING
PARTS
AND
ELECTRICAL
CONNECTIONS.
EXTRA
PRE-CAUTIONS
MUST
BE
TAKEN
DURING
TROUBLESHOOTING
SINCE
PROTECTIVE
COVERS
AND
SAFETY
DEVICES
MAY
BE
REMOVED
OR
DISABLED
TO
GAIN
ACCESS
AND
MAKE
TESTS.
BE
CAREFUL.
SERIOUS
PERSONAL
INJURY
OR
DEATH
CAN
RESULT
FROM
THESE
HAZARDS.
CONSULT
QUALIFIED
PERSONNEL
WITH
ANY
QUESTIONS.
Speed Deviations: The generator speed should be maintained at rated nameplate value during all
operating tests.
The
frequency and voltage
of
the generator output depends upon rotative speed.
If
the
generator runs slower than rated speed, voltage and frequency will drop
off
proportionately.
SYMPTOM:
GENERATOR
PRODUCES
NO
VOLTAGE,
OR
RESIDUAL
VOLTAGE
CAUSE
Low Speed.
Voltmeter Off.
Defective voltmeter.
Loss ofresidual
Open in stator windings.
service
CHECK
AND
REMEDY
Check driver RPM. Correct as necessary.
Check meter selector switch to insure it i not in the
Off
position.
Check voltage with separate meter
at
the generator terminals.
Flash the field. See "Restoring magnetism. Residual Magnetism"
Check for continuity in the windings. Return
to
factory,
or
take
to
shop
if
open.
16
To Next Page
Loading...