Using The Inverter For Special Motors; Power Transmission Mechanism (Speed Reducers, Belts And Chains) - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

Using the Inverter for Special Motors

Observe the following precautions when using a special motor.
Pole-changing Motor
The rated input current of pole-changing motors differs from that of standard motors. Select an appropriate
Inverter according to the maximum input current of the motor.
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 voltage drop and thereby motor torque
reduction.
Explosion-proof Motor
When an explosion-proof motor is to be used, it must be subjected 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.
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 damaging.
If the motor is to be operated at a speed higher than 50 Hz, consult the manufacturer.
Single-phase Motor
Do not use an Inverter for a single-phase motor. The motor should be replaced with a 3-phase motor.

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 experience problems with service life and durability if the motor is operated at low speeds
continuously.
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