Mccb Trips; Motor Has Over Temperature; Communication Is Not Available - Panasonic VF100 Instruction Manual

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?
No
MCCB failure or inverter malfunction.
(Please inquire.)

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?
Yes
Does an open phase exist in the
output of the inverter?
No
The inverter malfunction.
(Please inquire.)

5. Communication is not available.

Is wiring correct?
Yes
Is communication setting correct?
Yes
Does noise exist?
No
Inverter malfunction.
(Please inquire.)
Note) Use a residual current circuit breaker that
supports the inverter.
Yes
•EReduce the motor load factor.
•EIncrease the motor capacity.
(If the motor capacity exceeds the inverter
capacity, increase the latter as well.)
No
•EReduce voltage/frequency characteristics.
No
•EReduce the motor load factor, or carry
out forced cooling.
•EIncrease the motor capacity.
(If the motor capacity exceeds the inverter
capacity, increase the latter as well.)
•ECheck if output frequency can be increased
for use.
Yes
•EReduce the noise around the inverter.
•ESeparate the communication cable and
the other wirings.
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