Product Description:

The RD52.1-4N-110-W-V1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. The unit interfaces with automation systems that need variable-speed regulation of three-phase motors, supplying controlled current and voltage to maintain commanded torque profiles across changing load conditions. By closing the loop on motor flux and slip, the controller supports consistent process behavior in material handling, machining, and pumping lines. This control method helps the connected motor hold speed and torque more accurately during acceleration, steady running, and load transitions.

Its rated output is 110 kW, allowing the module to drive large induction or synchronous machines without derating in normal operation. The controller uses a three-phase AC converter input to form the DC link, rectifying the mains before generating a pulse-width-modulated output for the motor. Acceptable line voltage spans 380 to 480 V, and operation remains stable within a supply variation of ±10 %, which suits industrial power systems with moderate fluctuation. Vector regulation is handled through field-oriented vector control, which calculates stator current components in real time to match demanded electromagnetic torque. Heat from the switching devices is removed by liquid cooling, and an integrated mains filter helps reduce conducted emissions to nearby equipment.

This is a design generation 1 unit, and it uses the original mechanical footprint of the series. The controller is supplied without a built-in brake chopper, so external dynamic braking hardware is needed when high-inertia loads must decelerate quickly or stop under regenerated energy. For control power, an auxiliary input provides 24 V standby power, allowing parameter retention and diagnostic access while the main supply is off. Software is ordered separately for this model, so the required firmware revision can be selected for the intended application.