Product Description:

The RD52.1-4B-018-L-NN-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. Installed in a control cabinet, it connects plant line power to induction or synchronous motors and regulates speed and torque in automated lines, conveyors, and material-handling cells. The unit exchanges setpoints and status data with higher-level PLCs over common industrial fieldbuses, converting commands into variable-frequency, variable-voltage output for controlled motor operation. Electronic regulation replaces mechanical throttling, which helps improve energy use and maintain consistent motion profiles during repeated production cycles.

At the output stage, this model supplies 18.5 kW of continuous mechanical power, which suits medium-power axes that require steady torque across a wide speed range. The input section accepts three-phase line voltage from 380 to 480 V, and its rectifier and DC link tolerate line variation of ±10 % so operation remains stable when the incoming supply fluctuates. The Converter 3 x AC supply class means the AC-to-DC-to-AC conversion functions are contained in one housing, which simplifies panel wiring and reduces the need for separate external stages. Current vectors are resolved by field-oriented vector control, separating flux and torque so the drive responds more accurately during acceleration and changing load conditions.

A built-in brake chopper dissipates regenerated energy through an external resistor, preventing DC-link overvoltage during rapid deceleration. Heat from the power electronics is removed by forced air cooling, so the unit requires clear airflow through the cabinet area. To reduce conducted interference, an integrated mains filter is factory wired to the input and removes the need for a separate external filter. This controller is design generation 1, indicating the product generation used for this version of the drive.