Service manual

4. Troubleshooting
4-5
4.2.4 Load cannot be operated
4.2.5 Voltage drops when load is applied
Immediately the
circuit breaks
automatically.
Generated voltage and
frequency are normal?
NO
Circuit breaker (MCB) is
"ON"?
Turn MCB on.
Y
ES
NO
If it cannot be adjusted
at all, please refer to
troubleshooting "4.2.1
No voltage is generated
or voltage too low".
A
ny looseness in output
terminals R, S, T (U, V, W)
and O connection?
Specified voltage found at
load?
YES
When MCB is on, is specified
voltage found among output
terminals R, S, T, and O?
A
djust.
Y
ES
NO
Check load.
NO
Y
ES
Fault in MCB contact
or selector switch.
NO
YES
Retighten and
correct.
Check cable used for
load.
When the load is applied, how
is generator rpm?
Please refer to the
sentence "4.2.1 No
voltage is generated or
voltage too low".
Normal
Drop
Check whether load starting
kVA exceeds rated output of
generator?
Load capacity
too high.
OK
YES
A
ny problem in load or cable
such as short-circuit or loose
connections?
Reduce load capacity to suit generator
capacity. Or, use a higher kVA
generator that suits load capacity.
Repair.
Engine output
insufficient. Repair.
See Engine Manual.
NO