Product Description:

The RD51.2-5B-003-P-NN-FW is a drive controller produced by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. As a converter-based unit, it regulates the speed and torque of three-phase induction motors in automated machinery. By acting as the interface between the plant power bus and the motor windings, it provides the voltage and frequency conversion needed for conveyor lines, pumps, and general motion axes that require reliable variable-speed operation. Its converter architecture also supports smooth speed adjustment across changing process demands without relying on mechanical throttling methods.

This controller connects to a three-phase AC converter mains link and is intended for systems that supply a nominal bus of 500 V. Under these conditions, the unit can deliver a continuous output of 3.0 kW to the connected motor group. A built-in brake chopper absorbs regenerative energy during rapid deceleration, which can eliminate the need for an external resistor module on typical light-to-medium inertia loads. Regulation is performed through U/f curve control, so the drive maintains a set ratio between stator voltage and frequency and supports open-loop motor operation while keeping magnetization within an acceptable range. This control method is well suited to applications that need stable speed control with a straightforward drive setup.

Cooling relies on a heat dissipation panel for drives up to 18.5 kW, which transfers semiconductor losses to the cabinet surface without forced airflow and makes panel mounting practical in sealed enclosures. The unit is part of Design Generation 2, which identifies the second release of the RD 500 platform. It is not equipped with application add-ons, so optional technology functions such as positioning modules are not included. This makes the controller more appropriate for standard variable-speed duties where basic motor control is needed without added motion features.