15
WARNING
HIGH
VOLTAGES
MAY
BE
PRESENT
AT
THE
GENERATOR’S
TERMINALS WHEN
THE
UNIT
IS
RUNNING.
SOME
ACCESSORY
EQUIPMENT
SUCH
AS SPACE
HEATERS
MAY
BE
ENERGIZED
FROM
AN
OUTSIDE
POWER
SOURCE WHEN
THE
UNIT
IS
AT
REST. TOOLS, EQUIPMENT,
CLOTHING
AND
YOUR BODY
MUST
BE
KEPT
CLEAR
OF ROTATING PARTS
AND
ELECTRICAL CONNECTIONS. SPECIAL
PRECAUTIONS
MUST
BE
TAKEN
DURING
TROUBLESHOOTING SINCE
PROTECTIVE
COVERS
AND
SAFETY
DEVICES
MAY
BE
REMOVED
OR DISABLED
TO
GAIN
ACCESS
AND
PERFORM
TESTS. BE
CAREFUL. SERIOUS PERSONAL
INJURY
OR
DEATH
CAN
RESULT
FROM
THESE
HAZARDS. CONSULT
QUALIFIED
PERSONNEL
WITH
ANY
QUESTIONS.
GENERATOR PRODUCES NO VOLTAGE
CAUSE
CHECK AND REMEDY
Voltmeter off or defective
Check voltage with a separate meter at the generator terminals.
Incorrect or defective connections
Verify generator connections. See drawings supplied with the generator or lead
connection diagrams in this manual. Inspect all wiring for loose connections, open
circuits, grounds, and short circuits.
Loss of residual
Flash the field. Refer to field flashing in the service section. If the generator is equipped
with a PMG, field flashing is not necessary -- check regulator fuse and input power from
the PMG.
Defective diodes, suppressor, or
windings
Test the generator using the 12 volt battery test as specified in the testing section. If the
results indicate generator problems, perform insulation, continuity, and diode tests as
specified in the testing section.
Regulator protection operating
Adjust regulator. Consult regulator manual.
Regulator inoperative
Adjust or replace regulator. Consult regulator manual.
GENERATOR PRODUCES LOW VOLTAGE, NO LOAD
CAUSE
CHECK AND REMEDY
Underspeed operation
Check speed using a tachometer or frequency meter.
Voltmeter off or defective
Check voltage with a separate meter at the generator terminals.
Incorrect or defective connections
Verify generator connections. See drawings supplied with the generator or lead
connection diagrams in this manual. Inspect all wiring for grounds, open circuits and
short circuits.
Loss of regulator power
Check regulator fuse and input power. Input power is produced by the generator’s
residual voltage or from an optional PMG.
Regulator adjustment
Adjust regulator settings. Consult regulator manual.
Regulator incorrectly connected
Review the generator connection diagram or reference the regulator manual.
Defective diodes, suppressor, or
windings
Test the generator using the 12 volt battery test as specified in the testing section. If the
results indicate generator problems, perform insulation, continuity, and diode tests as
specified in the testing section.
Regulator inoperative
Adjust or replace regulator. Consult regulator manual.
