Troubleshooting (Generator) - MQ Power DCA300SSJU4F3 Operation Manual

Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a
breakdown, use Table 18 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
DCA300SSJU4F2/F3 60 HZ GENERATOR• OPERATION MANUAL — REV. #2 (04/18/22) — PAGE 69

TROUBLESHOOTING (GENERATOR)

Table 18. Generator Troubleshooting
Possible Problem
AC voltmeter defective?
Wiring connections loose?
Defective AVR?
Defective rotating rectifier?
Engine speed incorrect?
Wiring connections loose?
Defective AVR?
Wiring connections loose?
Defective AVR?
Short circuit in load?
Over current?
Defective circuit breaker?
Overcurrent relay actuated?
Solution
Check output voltage and replace if necessary.
Check wiring and repair.
Replace if necessary.
Check and replace.
Check and adjust.
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.
Confirm load requirement and reset.