Product Description:

The RD52.1-5N-400-R-V1-FW/S146 is manufactured by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. This high-power controller is used in automation cells to vary motor speed and torque according to process demands, allowing conveyors, extruders, and press drives to run with precise electrical regulation. It converts fixed-frequency three-phase power into a controlled output waveform, creates closed-loop feedback with resolver or encoder signals, and communicates status to supervisory PLC networks.

The unit delivers 400 kW of continuous output and draws energy through a Converter 3 x AC front end, so it accepts raw mains power without an external rectifier. Internal bus capacitors and gate circuits are sized for a 500 V operating window, which sets the creepage, clearance, and protective relay requirements. Dynamic response is obtained with field-oriented vector control, a modulation method that calculates instantaneous flux vectors instead of relying on scalar voltage-frequency curves. Semiconductors are mounted on a cold plate served by liquid cooling with an internal pump, which keeps junction temperatures stable when enclosure duty is too high for air cooling, simplifies panel airflow design, and allows higher switching frequencies at rated load.

The housing is supplied without a built-in brake chopper, so regenerative energy must be dissipated by an external resistor bank or returned through a common DC link. Control electronics stay active through 24 V standby power, which allows fieldbus diagnostics when the mains is not energized. The unit is design generation 1, and it uses the component footprints and option connectors of early RD 500 models. Application functions are selected separately so the control logic can match the requirements of the driven machine.