The VW3AE0675 is a sinus filter designed for the Altivar 71 Plus and Altivar 61 Plus drive series, specifically for floor-standing enclosures with separate air flows or compact versions. It's a protection accessory that cleans the motor voltage waveform, reducing motor heating and stress on the cable insulation — critical for long cable runs or older motor windings.
A sinus filter (also called a sine-wave filter or output filter) converts the PWM voltage pulses from the drive into a near-sinusoidal waveform at the motor terminals. This eliminates reflected-wave voltage spikes that can damage motor insulation on long cable runs, and reduces audible motor noise and bearing currents. For an Altivar 71 Plus or 61 Plus in a floor-standing cabinet, this filter bolts into the enclosure and connects between the drive output and the motor cable.