Product Description:

The RD51.1-4N-022-L-NN-FW/S111 is a drive controller from Bosch Rexroth Indramat in the RD 500 Drive Controllers series. It is intended for cabinet mounting, where it converts fixed-frequency three-phase mains power into a variable-frequency output for standard induction motors. By regulating voltage and frequency together, the unit helps process equipment maintain commanded speed under changing mechanical loads while supporting common applications such as pumps, fans, and conveying systems.

It accepts a line voltage between 380 to 480 V and uses a three-phase AC converter front end for direct connection to typical plant distribution systems. The inverter section can furnish up to 22 kW of shaft power, which is suitable for medium-duty motor applications in industrial equipment. Regulation follows U/f curve control, so the ratio of stator voltage to frequency remains constant and motor flux stays predictable across the operating range. Thermal management relies on forced air cooling, and the integrated fan directs air over the heat sink and power semiconductors to keep internal temperatures within allowable limits.

Within Design Generation 1, the base hardware is supplied without a built-in brake chopper, so applications with frequent deceleration or regenerative loads may require external braking support. An integrated mains filter reduces high-frequency interference on the supply conductors and helps the drive operate cleanly in shared electrical systems. Performance figures remain valid within a ±10 % tolerance for mains variation, which supports stable operation when incoming power is not perfectly constant. No additional function modules are installed in this configuration, so the controller is arranged for standard variable-speed motor control without extra built-in options.