Product Description:

The RD52.1-4B-011-L-NN-G3-T1-FW from Bosch Rexroth Indramat is a drive controller in the RD 500 Drive Controllers series. Industrial automation systems use this unit to regulate three-phase induction or synchronous motors in closed-loop applications by controlling voltage and frequency. By combining power conversion, filtering, and vector control in a single housing, the controller provides the interface between plant-level PLC commands and precise motor torque production. Its compact profile and panel-mount layout make it suitable for cabinets where space and airflow are restricted.

The controller operates on a line voltage window of 380 to 480 V, allowing connection to common industrial mains without an autotransformer. Acceptable input variation is held within ±10 %, so the converter can maintain stable DC-bus levels during moderate supply swings. Power is supplied through a three-phase AC converter input, which the internal rectifier processes before the inverter stages reproduce adjustable three-phase output. Motor torque is calculated and regulated through field-oriented vector control, giving high dynamic response even at low speeds. Thermal energy is removed by forced-air cooling, and the integrated fan channels airflow across the heat sink to help prevent component derating at continuous full-load current.

A built-in brake chopper is connected across the DC link, enabling external resistors to absorb regenerative energy during rapid deceleration without overvoltage trips. Interference on the supply side is mitigated by the integrated mains filter, which reduces conducted emissions and improves power-factor characteristics. This unit is classified as design generation 1. The parameter slot for additional application functions is not equipped, leaving space for an optional feature card if needed.