Using The Inverter For Special Motors; Power Transmission Mechanism (Speed Reducers, Belts And Chains) - Omron VARISPEED E7 User Manual

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 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 motor cable with high cross section to prevent voltage drop and thereby motor torque reduction.
Explosion-proof Motor
When an explosion-proof motor is 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. These motors are often equipped with phase-shift capacitors.
Any capacitor directly connected to the inverter output may damage the Inverter.

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 be
morey noisy and might experience problems with service life and durability if the motor is operated at low
speeds continuously.
Motor Application Precautions
10-5