Product Description:

The RD52.1-4B-315-R-W1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It serves as the central power stage between a three-phase mains supply and an induction or synchronous motor, converting fixed-frequency input power into regulated output for conveyors, mixers, and machining centers. By supporting closed-loop speed and torque control, the unit helps automated equipment maintain stable motion during changes in load or process demand. It also integrates readily with higher-level PLCs, which makes it suitable for coordinated industrial automation systems.

The controller is rated for 315 kW of continuous output and connects directly to mains supplies in the 380 to 480 V range. It is configured as a three-phase AC converter, so incoming line power is rectified to a DC link and then switched by the inverter stage to supply the motor. Control is based on field-oriented vector control, which supports rapid torque response, stable low-speed operation, and accurate speed regulation across changing load conditions. A built-in brake chopper handles regenerated energy by routing it to an external resistor during deceleration or back-driving events, which helps protect the DC bus from overvoltage.

For this output class, thermal management relies on liquid cooling with an internal pump, which helps hold power-section temperature within a stable operating range under sustained load. The controller accepts input voltage variation of ±10 %, reducing sensitivity to normal plant supply fluctuations, and an integrated mains filter helps limit conducted switching noise on the incoming line. Motor-side wiring is landed on 95 mm² terminals C and F, which provide the conductor capacity needed for a high-power installation. This arrangement supports large motor connections while keeping the power path direct and easy to route inside the cabinet.