Product Description:

The RZS02.1-6-080 sinusoidal filter is produced by Bosch Rexroth Indramat as part of the RZS Sinusoidal Filters series. Installed between a PWM inverter and an induction motor, the filter smooths the steep voltage edges generated by the drive so the motor windings receive a nearly sinusoidal waveform. This operating role is useful where long motor leads or insulation systems are more sensitive to fast switching pulses. By softening the inverter output, the unit can also reduce common-mode effects that add electrical stress at the motor terminals. Reducing dv/dt helps lower insulation stress, limit acoustic noise, and reduce motor bearing currents.

The device is rated for 3 x AC 380 to 400 V, matching common industrial supply systems used with compatible converters. It is assigned to power class 075, which places it in the corresponding performance range for suitable Indramat inverters. At continuous motor load, the choke and capacitors can carry 80 A of sinusoidal current, which suits drives in the 30 to 45 kW range. Across the adjustable drive output, the internal components maintain controlled impedance from 0 to 200 Hz, supporting both low-speed control and higher commanded motor speeds. The magnetic core supports carrier frequencies up to 8 kHz to prevent excess heating from high-frequency harmonics. The unit is part of product line 02 and uses Version 1.

During steady operation, the filter dissipates 420 W as heat, so cabinet ventilation or a heat sink plate is required to keep the internal temperature within class F limits. Even when the associated converter operates at its maximum output frequency, the differential inductance continues to limit voltage distortion and soften inverter edge stress at the motor terminals. The permitted supply variation of ±15 % allows stable filtering when plant voltage fluctuates. This helps maintain a smoother waveform at the motor and reduces ongoing stress on insulation and bearings.