Product Description:

The RD52.1-8N-055-L-NN-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. The unit interfaces between a DC link and an AC motor, modulating voltage and frequency so production lines, conveyors, and process pumps receive the speed and torque commands required for automated duty cycles. Because it performs closed-loop motor regulation internally, the drive reduces the processing burden on higher-level PLC hardware and provides direct feedback for diagnostic functions.

It performs motor regulation through field-oriented vector control, a method that calculates stator currents in real time so torque remains stable even at low speeds. The power section is rated at 55 kW, making it suitable for medium-sized industrial loads such as extruders or centrifuges. Incoming power is taken from an inverter DC bus, which allows multiple drives to share a common rectifier and regenerative energy path. The drive’s input window centers on 700 V, matching typical high-power DC links derived from 480 V three-phase mains. Thermal management relies on forced-air cooling, and the integrated fans move heat away from the IGBT modules during continuous operation.

The unit is identified as design generation 1, so its electrical terminals and parameter structure follow the first release layout of the RD 500 family. It is supplied without a built-in brake chopper, so applications that require dynamic braking need an external resistor and chopper assembly to dissipate excess DC-link energy. Standard software is not included, and the software package is ordered separately so the selected application can match the machine task. Internal option slots are empty, leaving room for future encoder interfaces or fieldbus modules without disassembling the main power section.