Multiquip DCA125USI3CAN manual Troubleshooting Generator, Symptom Possible Problem Solution

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 for approximately 17.3 ohms across J & K on CN1
	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.

DCA125USI3CAN 60 hz Generator • operation and parts manual — rev. #2 (09/24/13) — page 49