Chapter 7 Optional AccessoriesC2000 Plus
7-61
Sine-wave Filter
When there is longer cable length connected between the motor drive and the motor, the damping
leads to high frequency resonator, and makes impedance matching poor to enlarge the voltage reflection.
This phenomenon will generate twice-input voltage in the motor side, which will easily make motor voltage
overshoot to damage insulation.
To prevent this, installing sine-wave filter can transform PWM output voltage to smooth and
low-ripple sine-wave, and motor cable length can be longer than 1000 meters.
Installation
Install a Sine-wave filter in series between the three output phases U V W and the motor, as shown
in the figure below:
Figure 7-37 Wiring of non-shielded cable
Wiring of shielded cable
Figure 7-38 Wiring of shielded cable
AC motor drive Sine-wave filter
AC motor drive
Sine-wave filter
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