Troubleshooting (2) - Panasonic VF0 Series Instruction Manual

1. MCCB trips.
Motor has over temperature
2.
Inverter malfunction
(Contact Matsushita).
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Troubleshooting (2)

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).
Is the motor overloaded?
NO
Are V/F 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?
YES
manuals search engine
YES
YES
YES
YES
• Reduce the load factor.
• Increase the motor capacity.
(If the motor capacity exceeds the inverter
capacity, increase the latter as well).
NO
Reduce V/F characteristics.
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.
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