MQ Multiquip DCA20SPXU2, Operation And Parts Manual

Page: 44 / 74

PAGE 44 — DCA20SPXU2D 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #1 (03/25/11)
TROUBLESHOOTING (GENERATOR)
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a
breakdown, use Table 16 shown below for diagnosis of the Generator. If the problem cannot be remedied, consult our
company’s business offi ce or service plant.
Figure 44. 6-Pin Connector
Table 16. Generator Troubleshooting
Symptom Possible Problem Solution
Is wiring connection loose? Check wiring and repair.
Is AVR defective? Replace if necessary.
Defective Rotating Rectifi er? Check and replace.
Defective Exciter Field? Check for approximately 17.3 ohms across J & K on CN1
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? Confi rm load requirements and reduce.
Defective circuit breaker? Check and replace.
Over current Relay actuated? Confi rm load requirement and replace.
NOTICE
A digital controller is an electronic component. Before
the insulation resistance can be measured, be sure
to unplug the 6-pin connector as shown in Figure 44.
Failure to unplug the connector may cause serious
damage to the Digital Controller.