(2) Troubleshooting list
Trouble
Motor does
not start ***
Motor starts
and rotates
in wrong
direction a*.
Motor runs,
but its speed
cannot be
changed ***
Motor accele-
ration or decele-
ration is not
smooth a**
Checkup
Are all wirings correct?
Are voltages across power supply
terminals R and S, S and T, and
T and S normal (POWER and
CHARGE lamps should light) ?
.
Are there output voltages across
terminals U and V, V and W,
and W and U?
Is motor locked (due to excessively
large load) ?
Does ALARM lamp light? *
Is parameter set up properly?
Are wirings of output circuit in
correct phase sequence?
Are “FWD” and “REV” signal .
lines connected to correct
terminals?
Is frequency reference signai wiring
correct?
Is load too heavy?
Is time for acceleration or deceleration
too short?
Remedy
Correct wirings.
Supply voltages.
Supply voltages.
Remove cause of locking
of motor.
See the previous page.
Check settings.
Correct output phase
sequence.
“FWD” signal:
Terminals STF - SD
closed
“REV” signal:
Terminals STR - SD
closed
Correct frequency reference
signal wiring.
Lighten load.
Prolong acceleration or
deceleration time.
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