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Chapter 7 Optional Accessories CFP2000
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 sin wave, and motor cable length can be longer than 1000 meters.
Installation
Sine-wave filter is serially connected between motor drive UVW output side and motor, which is
shown as below:
AC motor drive
AC motor drive
Wiring of shielded cable
Sinewave filter
Wiring of non-shielded cable
Sinewave filter
Wiring of shielded cable
7-26
Figure 7-27
Figure 7-28
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