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Precautions for use
Driving a 400 V
general-purpose
motor
When driving a 400V general-purpose motor with an inverter
using extremely long wires, damage to the insulation of the
motor may occur. Use an output circuit filter (OFL) if
necessary after checking with the motor manufacturer. Fuji
motors do not require the use of output circuit filters because
of their reinforced insulation.
Torque
characteristics
and temperature
rise
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 decrease the
output torque of the motor.
Vibration
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-proof rubber is
recommended.
* Use the inverter's jump frequency control feature to skip
the resonance frequency zone(s).
In running
general-
purpose
motors
Noise
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.
High-speed
motors
If the reference 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.
Explosion-proof
motors
When driving an explosion-proof motor with an inverter, use
a combination of a motor and an inverter that has been
approved in advance.
Submersible
motors and
pumps
These motors have a larger rated current than
general-purpose motors. Select an inverter whose rated
output current 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.
Brake motors
For motors equipped with parallel-connected brakes, their
power supply for brake must be supplied from the primary
circuit. If the power supply for brake is connected to the
inverter's output circuit by mistake, the brake will not work.
Do not use inverters for driving motors equipped with
series-connected brakes.
In running
special
motors
Geared motors
If the power transmission mechanism uses an oil-lubricated
gearbox or speed changer/reducer, then continuous
operation at low speed may cause poor lubrication. Avoid
such operation.
