Is line voltage applied to
L1, L2 or L3 terminals (is the charging
indicator illuminated)?
Check if the power source is on.
Turn power source OFF and then ON
again.
Reconfirm the line voltage level.
Is there voltage at output
terminals T1, T2 and T3?
Turn power source OFF and then ON
again.
Is the motor wired correctly?
Check motor wiring.
Are there any abnormal controller
conditions?
Motor
inoperative
Is the forward or reverse instruction
loaded?
Refer to malfunction handling
instructions to examine and correct
wiring.
Is the analog frequency setting loaded?
Check if the wiring for the analog
frequency input signal is correct.
Motor
inoperative
Is the operation mode setting correct?
Check if the frequency input setting
voltage is correct.
Is the wiring on output terminals T1, T2
and T3 correct?
Operate by digital?
Motor operates in
opposite direction
Is the wiring for the forward and reverse
signals correct?
Wiring should be in accordance with the
U, V, W terminals of the motor.
Is the wiring for the analog frequency input
correct?
Examine the wiring and correct it.
Is the operation mode setting correct?
Examine the wiring and correct it.
Motor operation
speed fixed
Is the loading excessive?
Reduce the load.
Is the specification of the motor (poles,
voltage) correct?
Check motor specification.
Is the gear ratio correct?
Check gear ratio.
Is the highest output frequency setting
correct?
Check highest output frequency.
Motor operates
at speeds too
high or too low
Is the motor voltage too low?
Check motor voltage.
Is the loading excessive?
Increase controller and motor capacity.
Is the loading variation too large?
Reduce loading variation.
Abnormal speed
variation at
operation
Is the input power source steady and
stable?
Install an AC reactor on the line supply.
ABNORMALITY
CHECK POINT
COUNTERMEASURE
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3.4 GENERAL MALFUNCTION EXAMINATION METHOD
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ACE10UG