Generator Produces no Voltage

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.

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	Test the generator using the 12 volt battery test as specified in the testing section. If the
windings	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

Underspeed operation Voltmeter off or defective Incorrect or defective connections

CHECK AND REMEDY

Check speed using a tachometer or frequency meter.

Check voltage with a separate meter at the generator terminals.

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	Test the generator using the 12 volt battery test as specified in the testing section. If the
windings	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.