Product Description:

The RD52.1-4B-004-P-NN-FW drive controller is built by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. It acts as the regulated power interface between the plant-level control network and a three-phase motor, processing reference values from the PLC and generating variable-frequency output that matches load demands. By converting incoming mains energy and supervising current, voltage, and torque, the unit supports coordinated motion sequences in packaging, conveying, and forming equipment.

Its motor regulation algorithm is based on field-oriented vector control, which calculates stator flux in real time so dynamic torque tracking is maintained even at low speed. During fast deceleration, the built-in brake chopper routes regenerative energy to an external resistor and helps prevent DC-bus overvoltage. Input power conditioning is handled by an integrated mains filter that reduces conducted electromagnetic interference before it reaches the supply. The power stage is a three-phase AC converter, meaning the rectifier and inverter are supplied from a three-phase line. Thermal energy from ratings up to 18.5 kW is transferred to a heat dissipation panel, allowing panel-mount installation without forced ventilation.

The electrical interface accepts voltages from 380 to 480 V, giving flexibility when the plant distributes either 400 V or 460 V utility feeds. Allowed fluctuations are limited to ±10 %, so voltage swings outside this band trigger protective shutdown. The product is built as design generation 1, which keeps it aligned with components from the same release cycle. Functional expansion slots are not equipped, so the enclosure does not include option modules. Application software is ordered separately, which allows the controller to be matched to the required operating functions.