Product Description:

The RD52.1-4N-160-R-NN-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. As a converter, it regulates three-phase motor power in automated machinery, allowing precise speed and torque commands from higher-level control systems. The unit forms the interface between the plant’s line supply and the motor shafts, making it central to coordinated motion on production lines, test benches, and continuous process equipment. In this role, it adjusts output frequency and voltage as process demand rises or falls, which supports smooth starts, controlled acceleration, and stable running at target speed.

This controller operates on a line voltage of 380 to 480 V, a range that covers common industrial distribution levels and permits global installation without internal tap changes. It draws energy through a three-phase AC converter input, then synthesizes a variable-frequency output matched to the connected motor set. The power stage is rated for 160 kW, so it can drive large pumps, extruders, or multi-motor groups while maintaining thermal limits. High losses are removed by liquid cooling with an internal pump, a method that keeps semiconductor temperatures stable when installed power is high and cabinet airflow alone is insufficient. Motor flux and torque are handled through field-oriented vector control, enabling dynamic response and low-speed accuracy that scalar methods cannot deliver.

The power section is supplied without a built-in brake chopper, so external energy-dissipation hardware is needed only when regenerative peaks are expected. An integrated line filter attenuates conducted emissions and helps reduce the need for extra input components. The allowable input variation is ±10% input tolerance, which helps the controller remain functional during utility fluctuations or transformer tap errors. Control software is not preloaded, and firmware must be ordered separately so the installed functions match the target machine. This allows the drive to be prepared for the intended operating mode rather than including unused software functions.