Product Description:

The RD52.1-4B-022-L-LV-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. In an automation cell, it functions as the closed-loop interface between the line supply and an AC motor, modulating voltage and frequency to match commanded speed or torque profiles. By housing power electronics, logic, and diagnostic circuitry in one enclosure, it simplifies coordinated motion in conveyors, extruders, and material-handling stations.

Rated output is 22 kW, so the controller can drive medium-power machinery without oversizing. It accepts a line input of 380 to 480 V, which covers common three-phase plant power systems, and it maintains control accuracy through field-oriented vector control that separates stator current into torque and flux components for responsive operation. Heat produced by the switching devices is removed through forced air cooling, so the installation must allow unobstructed airflow while avoiding the complexity of liquid cooling circuits. A built-in brake chopper directs regenerated energy into a resistor, helping protect the DC link during rapid deceleration or overhauling loads without requiring an external braking module.

The power section uses a 3 × AC converter input, so it connects to a three-phase supply. An integrated line filter attenuates conducted emissions, which usually reduces the need for additional EMC components in the panel. Input fluctuations are tolerated within a ±10 % window, permitting operation on networks that experience moderate voltage variation. For control continuity during power loss, the unit supports 24 V standby power from an external source, allowing the drive bus and encoder channels to remain active for status retention. The control platform also supports cable-damping feedback and other C3/D3 functions for applications that require stable drive behavior.