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DCA70SSJU4i
Generator Troubleshooting
Symptom Possible Problem Solution
No Voltage Output
AC Voltmeter defective? Check output voltage using a voltmeter.
Is wiring connection loose? Check wiring and repair.
Is AVR defective? Replace if necessary.
Defective Rotating Rectifier? Check and replace.
Defective Exciter Field? Check for approximately 19 ohms across J & K on CN1
Low Voltage Output
Is engine speed correct? Turn engine throttle lever to “High”.
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.
Circuit Breaker Tripped
Short Circuit in load? Check load and repair.
Over current? Confirm load requirements and reduce.
Defective circuit breaker? Check and replace.
Over current Relay actuated? Confirm load requirement and replace.
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.
TROUBLESHOOTING GENERATOR