Product Description:

The RD52.1-4B-022-L-NN-NN-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. It is intended for integration into cabinet-mounted inverter assemblies where it converts three-phase line power into regulated motor voltage and frequency. Within an automated plant, the unit modulates speed, torque, and direction so conveyors, pumps, or positioning axes follow commands from a higher-level PLC. Because the product combines the power stage and control electronics in one housing, it simplifies wiring and helps reduce panel space.

The control method is field-oriented vector control, which maintains real-time alignment between stator currents and rotor flux to support precise torque response even at low speed. The power section is rated for 22 kW, allowing it to drive medium-sized asynchronous or synchronous machines in continuous duty. Incoming energy is accepted from a 380 to 480 V mains supply through a 3 × AC converter front end. The device tolerates line variations of ±10 %, so it can continue operating through modest grid fluctuation. These electrical limits set the acceptable range for compatible motors and transformer sizing.

Thermal and dynamic demands are handled by a built-in brake chopper that diverts regenerative energy into an external resistor and by forced-air cooling, which moves heat away from the heat sink with a fan mounted in the housing. Line-side interference is reduced by an integrated mains filter, which removes the need for separate EMC hardware in many installations. The hardware platform corresponds to Generation 1, so the unit matches the first design cycle for this platform. The option slots are not equipped, which allows additional I/O or communication modules to be added later if needed.