1-8
Chap. 1
BEFORE USING THE INVERTER
1.3.3 Precautions in using special motors
When using special motors, note the followings.
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. Decrease the thermal time
constant of the electronic thermal overload protection to match the motor rating.
Brake motors
For motors equipped with parallel-connected brakes, their power supply for braking must be supplied from the inverter input
(primary) circuit. If the power supply for braking is mistakenly connected to the inverter's output (secondary) circuit, the
brake may not work when the inverter output is shut down. Do not use inverters for driving motors equipped with
series-connected brakes.
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.
Synchronous motors
It is necessary to take special measures suitable for this motor type. Contact your Fuji Electric representative for details.
Single-phase motors
Single-phase motors are not suitable for inverter-driven variable speed operation.
High-speed motors
If the reference frequency is set to 120 Hz or higher to drive a high-speed motor, test-run the combination of the inverter and
motor beforehand to check it for the safe operation.
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