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(3) If the motor stalls during acceleration
YES
YES
YES
Is the inertia moment
of the motor or
the load excessive?
Is a special motor used?
Has the motor terminal
voltage dropped?
Reduce the inertia moment
of the load or increase
the inverter capacity.
Is the torque of
the load excessive?
Is the torque boost
set correctly?
Faulty inverter or error
due to noise, etc.
Contact Fuji Electric.
Increase the torque boost.
The motor stalls
during acceleration.
Prolong the time.
NO
Is the acceleration
time too short?
YES
NO
NO
NO
NO
NO
Use a thicker cable
between the inverter
and the motor or
shorten the cable length.
YES
Reduce the torque of
the load or increase
the inverter capacity.
Contact Fuji Electric.
YES
(4) If the motor generates abnormal heat
NO
YES
YES
Is the torque
boost excessive?
Reduce the torque boost.
Has the motor been
operated continuously
at a very low speed?
Use a motor exclusive
to the inverter.
Is the load excessive?
Reduce the load or
increase motor capacity.
Is the inverter output
voltage (at terminals
U, V, W) balanced?
Faulty motor
Faulty inverter or error
due to noise, etc.
Contact Fuji Electric.
YES
NO
YES
NO
NO
The motor generates
abnormal heat.
Note: Motor overheating following a higher frequency
setting is likely the result of current waveform.
Contact Fuji Electric.