Omron SYSDRIVE 3G3RV, User Manual

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Using the Inverter for Special Motors
Observe
the following precautions when using a special motor.
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Pole-changing Motor
The
rated input current of pole-changing motors differs from that of standard motors. Select, therefore, an
appropriate
Inverter according to the maximum input current of the motor to be used. Before changing the
number
of poles, always make sure that the motor has stopped. Otherwise, the overvoltage protective or over-
current
protective mechanism will be actuated, resulting in an error.
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Submersible Motor
The
rated input current of submersible motors is higher than that of standard motors. Therefore, always select
an
Inverter by checking its rated output current. When the distance between the motor and Inverter is long, use
a
cable thick enough to connect the motor and Inverter to prevent motor torque reduction.
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Explosion-proof Motor
When
an explosion-proof motor is to be used, it must be subject to an explosion-proof test in conjunction with
the
Inverter. This is also applicable when an existing explosion-proof motor is to be operated with the Inverter.
Since
the Inverter itself is, however, not explosion-proof, always install it in a safe place.
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Gearmotor
The
speed range for continuous operation differs according to the lubrication method and motor manufacturer.
In
particular, continuous operation of an oil-lubricated motor in the low-speed range may result in burning. If
the
motor is to be operated at a speed higher than 60 Hz, consult with the manufacturer.
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Synchronous Motor
A
synchronous motor is not suitable for Inverter control. If a group of synchronous motors is individually
turned
ON and OFF, synchronism may be lost.
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Single-phase Motor
Do
not use an Inverter for a single-phase motor. The motor should be replaced with a 3-phase motor.
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Power Transmission Mechanism (Speed Reducers, Belts, and Chains)
If
an oil-lubricated gearbox or speed reducer is used in the power transmission mechanism, oil lubrication will
be
affected when the motor operates only in the low-speed range. The power transmission mechanism will
make
noise and the service life and durability will be reduced if the motor is operated at a speed higher than 60
Hz.