Product Description:

The RZS02.1-6-040 is a drive accessory produced by Bosch Rexroth Indramat for the RZS Sinusoidal Filters series. Mounted between a Rexroth inverter and its connected motor, the unit converts the pulse-width-modulated drive voltage into a near-sinusoidal waveform. By damping voltage steepness and high-frequency components, it protects motor insulation, decreases stray electromagnetic emission, and minimizes bearing currents in automated production machinery. This kind of output conditioning is especially useful when cable runs are long enough for reflected-wave effects to raise peak voltage at the motor terminals. It is intended for distributed drive packages operating on long motor leads where common-mode noise and corona effects can otherwise degrade cabling and adjacent sensors.

The filter is designed for a three-phase supply of 3 × AC 380–400 V, and it tolerates line-voltage variation of ±15 %, allowing operation on utility grids that deviate from nominal value. Its L-C network is tuned for an operating range of 0–200 Hz, matching the speed range delivered by standard frequency converters. Internally, the coils are sized for a carrier frequency of 8 kHz, so switching harmonics at this rate are effectively suppressed before they reach the motor windings. That filtering action helps reduce voltage stress on insulation systems and can lower audible motor noise compared with a direct PWM output connection. The unit is version 1.

Stable attenuation is maintained across the operating range, so extended motor cables can be used without exceeding permitted dv/dt. The unit is part of product line 02, and its footprint and terminal spacing match related second-generation accessories. As a Sinusoidal filter, it presents low impedance at the fundamental frequency while blocking much of the switching spectrum, which helps limit additional power loss. It is intended for long motor leads, where reduced voltage stress helps protect cable insulation and motor windings. The smoother output waveform also helps reduce interference seen by nearby sensors, feedback devices, and other control wiring routed through the same machine enclosure.