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38
Troubleshooting
Inspection to determine cause of problem
When a problem occurs, perform the inspections and take the measures prescribed in the
following table. If you cannot determine the cause of the problem, if you suspect that the
inverter is not working properly, if a part is damaged, or there are any other problems you
cannot solve, contact your Panasonic dealer.
Problem
Possible cause
Corrective action
Improper wiring
Correct wiring.
Power is not fed to power input
terminals.
Turn on power.
Turn off and then on power.
LED on the operation panel is
unlit.
Check power supply.
Not a rated voltage on the supply
input terminals.
Check the voltage.
Error is displayed.
See Section [Protective function].
Free-run command is issued.
Cancel the command.
Both CCW and CW switches are
on.
Turn off unnecessary one.
Check if the frequency setting is
correct.
Check the frequency setting.
Motor is locked or overloaded.
Release the lock or reduce the
load.
Motor won't run
One phase is missing.
Check wiring between the inverter
and motor.
Motor runs in
wrong direction
Check the output terminals (U/T1,
V/T2 and W/T3) for incorrect
phase order.
Match the phase order of the output
terminals (U/T1, V/T2 and W/T3)
with those of the motor terminals.
Motor runs but
cannot change
speed
Motor is overloaded.
Reduce the load.
No. of phases and voltage of the
motor do not match those of
power source.
Check the specifications and the
identification plate.
Voltage on power input terminal
(R/L1, S/L2 or T/L3) is out of spec.
Check the voltage.
Check if the frequency setting
range is correct.
Check [
Lower limit frequency]
and [
Upper limit frequency].
Check if the motor’s terminal
voltage is extremely low.
Check [
Base frequency],
[
Maximum output voltage adjustment]
and [
V/F reduction
characteristic].
Motor runs at
incorrect speed
Motor is overloaded.
Reduce the load.
Unstable motor
speed
Load varies excessively.
Keep fluctuations in the load at
minimum. Replace with larger
inverter and motor set.
