Troubleshooting (2) - Panasonic VF0 Series 400V class Instruction Manual

1. MCCB trips.
Is MCCB of suitable rating?
Is input/output terminal wiring correct?
Does a ground fault exist in main circuit wiring?
MCCB failure or inverter malfunction
(Contact Matsushita).
Motor has over temperature
2.
Is the motor overloaded?
Are V/F characteristics
correct?
Is the load factor reduction
correct for continuous
operation at low frequency?
Does an open phase exist in
the output of the inverter?
Inverter malfunction
(Contact Matsushita).

Troubleshooting (2)

YES
YES
YES
YES
NO
NO
YES
NO
YES
YES
• Reduce the load factor.
• Increase the motor capacity.
(If the motor capacity exceeds the inverter
capacity, increase the latter as well).
Reduce V/F characteristics.
• 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.
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