Multiquip DCA40SSKU4i manual Troubleshooting Generator, Generator Troubleshooting

Troubleshooting (Generator)

Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a breakdown, use Table 19 shown below for diagnosis of the Generator. If the problem cannot be remedied, consult our company’s business office or service plant.

Table 19. Generator Troubleshooting

Symptom	Possible Problem	Solution
	AC Voltmeter defective?	Check output voltage using a voltmeter.
	Is wiring connection loose?	Check wiring and repair.
No Voltage Output	Is AVR defective?	Replace if necessary.
	Defective Rotating Rectifier?	Check and replace.
	Defective Exciter Field?	Check and replace.
	Is engine speed correct?	Turn engine throttle lever to “High”.
Low Voltage Output	Is wiring connections loose?	Check wiring and repair.
	Defective AVR?	Replace if necessary.
High Voltage Output	Is wiring connections loose?	Check wiring and repair.
	Defective AVR?	Replace if necessary.
	Short Circuit in load?	Check load and repair.
Circuit Breaker Tripped	Over current?	Confirm load requirements and reduce.
	Defective circuit breaker?	Check and replace.
	Over current Relay actuated?	Confirm load requirement and replace.

When the Emergency/Malfunction shutdown system has been activated, the engine will be stopped and the pre-heat lamp will indicate the malfunction by a series of flashing patterns. The flashing patterns and corrective action are shown below in Table 20. The flashing patterns consist of combinations of one or more long flashes and one or more short flashes.

Table 20. Engine/Generator Troubleshooting (Pre-heat Lamp)

Type of Fault	Possible Fault	Pre-Heat Lamp	Solution
		Indication
Engine Overspeed	115% or more rated RPM speed?	Long 1 Short 1	Check electronic governor
Low Oil Pressure	Oil pressure 7 psi (49 kPa) or	Long 1 Short 2	Check oil level.
	greater?
Insufficient Charge	No Voltage of Charging Genset?	Long 1 Short 3	Check wiring and repair.
High Water Temperature	Engine Overheat, 230° F (110° C)?	Long 1 Short 4	Check cooling system.
	Engine Overheat, 248° F (120° C)?	Long 1 Short 6	Check cooling system.
Emergency Stop	Emergency Stop signal detected?	Long 1 Short 5	Check and repair fault
Starter Motor Protection	Starter motor run for 12 seconds	Long 1 Short 7	Check wiring and repair.
	or more?
Rotation Sensor	Defective sensor, short circuit?	Long 2 Short 1	Check wiring and repair.
Solenoid	Defective solenoid, short circuit?	Long 2 Short 2	Check wiring and repair.
Water Temperature	Disconnection	Long 2 Short 4	Check connection.
Sensor	Short Circuit	Long 2 Short 5	Check sensor. Replace.
Charging Gen. Terminal	Disconnection	Long 2 Short 6	Check connections.
Over Voltage	VCC 18 volts or greater	Long 3 Short 1	Check overcurrent relay.

page 46 — DCA40sskU/ku4i 60 hz Generator • operation and parts manual — rev. #1 (03/11/13)