Using The Inverter For Special Motors - Omron SYSDRIVE 3G3FV User Manual

Appendix
Noise
Noise is almost the same as when the motor is operated with a commercial power supply. Motor noise,
however, becomes louder when the motor is operated at a speed higher than the rated speed (60 Hz).
H Using the Inverter for Special Motors
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 overcurrent protective mechanism will be actuated, resulting in an error.
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.
Explosion-proof Motor
When an explosion-proof motor or increased safety-type 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.
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 manufac-
turer.
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.
Single-phase Motor
Do not use an Inverter for a single-phase motor. The motor should be replaced with a 3-phase motor.
H Power Transmission Mechanism (Speed Reducers, Belts, and Chains)
If an oil-lubricated gearbox or speed reducer is used in the power transmission mechanism, oil lubrica-
tion 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 oper-
ated at a speed higher than 60 Hz.
Chapter 10
10-3