7-7
(3) The motor loses speed during acceleration.
The motor loses
the speed during
acceleration.
YES
Increase the time.
Check if the
acceleration time is
too short.
NO
Check if the inertia
moment of the motor
or load is too large.
NO
YES
Check if a special
motor is used.
YES
Contact Fuji
Electric.
NO
Use thicker cables
for the wiring
between the
inverter the motor
or reduce the wiring
length.
Check if there is
voltage drop at the
terminal of the motor.
NO
YES
Reduce the inertia
moment of the load
or increase the
inverter capacity.
Reduce the torque
of the load or
increase the
inverter capacity.
Check if the torque of
the load is too large.
NO
YES
Check if the torque
boost amount is
proper.
NO
YES
Failure of the inverter,
malfunction due to electric
noise or other cause is
probable. Contact Fuji
Electric.
Increase the torque
boost amount.
(4) Excessive heat generation from motor
Excessive heat
generation from
motor
YES
Reduce the torque boost
amount.
Check if the torque
boost amount is too
large.
NO
Check if continuous
operation is made at
extremely low speed.
NO
YES
Check if the load is
too large.
NO
Check if the output
voltages (at U, V and
W terminals) of the
inverter are balanced.
NO
Failure of the inverter,
malfunction due to electric noise
or other cause is probable.
Contact Fuji Electric.
Use a special motor
designed for the
inverter.
YES
Reduce the load or
increase the motor
capacity.
YES
Failure of motor
Note: Heat generation with a large
frequency setting may be caused by
the waveform of the current. Contact
Fuji Electric.
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