3. MCCB trips.
Is the capacity selection of MCCB correct?
Yes
Is input/output terminal wiring correct?
Yes
Does a ground fault exist in main circuit wiring?
MCCB failure or inverter malfunction.
(Please inquire.)
Note) Use a residual current circuit breaker that
supports the inverter.
No
4. Motor has over temperature.
Is the motor overloaded?
No
Are voltage/frequency characteristics correct?
Yes
Is the load factor reduction correct for
continuous operation at low frequency?
The inverter malfunction.
(Please inquire.)
Yes
・
Reduce the motor load factor.
・
Increase the motor capacity.
(If the motor capacity exceeds the inverter
capacity, increase the latter as well.)
No
・
Reduce voltage/frequency characteristics.
Does an open phase exist in the
output of the inverter?
Yes
No
No
・
Reduce the motor load factor, or carry
out forced cooling.
・
Increase the motor capacity.
(If the motor capacity exceeds the inverter
capacity, increase the latter as well.)
・
Check if output frequency can be increased
for use.
5. Communication is not available.
Is wiring correct?
Yes
Is communication setting correct?
Yes
Does noise exist?
Inverter malfunction.
(Please inquire.)
No
Yes
・
Reduce the noise around the inverter.
・
Separate the communication cable and
the other wirings.
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