Troubleshooting Generator - MQ Power DCA25SSIU4F Operation Manual

Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a
breakdown, use Table 15 shown below for diagnosis of the Generator. If the problem cannot be remedied, consult our
company's business office or service plant.
Symptom
No Voltage Output
Low Voltage Output
High Voltage Output
Circuit Breaker Tripped
PAGE 40 — DCA25SSIU4F 60 HZ GENERATOR • OPERATION MANUAL — REV. #4 (01/17/18)

TROUBLESHOOTING GENERATOR

Table 15. Generator Troubleshooting
Possible Problem
AC Voltmeter defective?
Is wiring connection loose?
Is AVR defective?
Defective Rotating Rectifier?
Defective Exciter Field?
Is engine speed correct?
Is wiring connections loose?
Defective AVR?
Is wiring connections loose?
Defective AVR?
Short Circuit in load?
Over current?
Defective circuit breaker?
Over current Relay actuated? Confirm load requirement and replace.
Solution
Check output voltage using a voltmeter.
Check wiring and repair.
Replace if necessary.
Check and replace.
Check for approximately 19 ohms across J & K on CN1
Turn engine throttle lever to "High".
Check wiring and repair.
Replace if necessary.
Check wiring and repair.
Replace if necessary.
Check load and repair.
Confirm load requirements and reduce.
Check and replace.