The VW3AE0671 is a sinus filter from the Altivar 71 Plus range, designed as a protection accessory for Altivar floor-standing enclosures with separate air flows or compact versions.
What a sinus filter does in this drive family
A sinus filter sits between the drive output and the motor, converting the PWM waveform into a near-sinusoidal voltage. That reduces motor bearing currents, winding stress, and audible noise — particularly important on long cable runs or with older motor insulation. This specific accessory is sized for the Altivar floor-standing enclosure layout, meaning it integrates into the cabinet's air-flow path rather than being a standalone add-on.