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Precautions for use
Driving a 400V
general-purpose
motor
Torque charac-
teristics and tem-
perature rise
In running
general-
purpose
motors
Vibration
Noise
High-speed mo-
tors
Explosion-proof
motors
In running
Submersible
special
motors and
pumps
motors
Brake motors
When driving a 400V general-purpose motor with an
inverter using extremely long wires, damage to the insula-
tion of the motor may occur. Use an output circuit filter
(OFL) if necessary after checking with the motor manufac-
turer. Fuji's motors do not require the use of output circuit
filters because of their reinforced insulation.
When the inverter is used to run a general-purpose motor,
the temperature of the motor becomes higher than when it
is operated using a commercial power supply. In the low-
speed range, the cooling effect will be weakened, so de-
crease the output torque of the motor. If constant torque is
required in the low-speed range, use a Fuji inverter motor or
a motor equipped with an externally powered ventilating fan.
When an inverter-driven motor is mounted to a machine,
resonance may be caused by the natural frequencies of the
machine system.
Note that operation of a 2-pole motor at 60 Hz or higher
may cause abnormal vibration.
* The use of a rubber coupling or vibration dampening rub-
ber is recommended.
* Use the inverter's jump frequency control feature to skip
the resonance frequency zone(s).
When an inverter is used with a general-purpose motor, the
motor noise level is higher than that with a commercial
power supply. To reduce noise, raise carrier frequency of the
inverter. Operation at 60 Hz or higher can also result in
higher noise level.
If the set frequency is set to 120 Hz or more to drive a high-
speed motor, test-run the combination of the inverter and
motor beforehand to check for safe operation.
When driving an explosion-proof motor with an inverter, use
a combination of a motor and an inverter that has been ap-
proved in advance.
These motors have a larger rated current than general-
purpose motors. Select an inverter whose rated output cur-
rent is greater than that of the motor.
These motors differ from general-purpose motors in thermal
characteristics. Set a low value in the thermal time constant
of the motor when setting the electronic thermal function.
For motors equipped with parallel-connected brakes, their
braking power must be supplied from the primary circuit. If
the brake power is connected to the inverter's power output
circuit by mistake, the brake will not work.
Do not use inverters for driving motors equipped with series-
connected brakes.
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