Product Description:

The RD51.1-4N-110-L-NN-FW/S111 is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. The unit converts fixed mains power into adjustable three-phase output so asynchronous motors in transport lines, mixers, and fan arrays can maintain stable torque and speed as operating demand changes. It is intended for cabinet-based installations where coordinated motor control is required across continuous industrial processes. In a modular drive lineup, it mounts beside rectifier and line components, communicates with higher-level PLCs through standard bus hardware, and stores parameter sets for acceleration ramps, current limits, and trip thresholds.

The controller accepts an input range of 380 to 480 V and tolerates line variation of ±10 % without derating. Its power bridge is rated for 110 kW, and motor behavior is regulated through U/f curve control to match output voltage and frequency during speed changes. Heat from the power section is removed by forced air cooling, so the cabinet must provide steady airflow for continuous operation. This control method is commonly used with induction motors that need predictable speed response and dependable operation under changing mechanical load.

As a 3 x AC converter, the RD51.1 module delivers variable-frequency output for industrial motor control. It is supplied without a built-in brake chopper, so braking energy must be handled by external equipment when the application has high deceleration demand. The mains filter is integrated, which helps reduce conducted interference on the supply connection, and the application section is not equipped with option cards. The unit is supplied without operating software loaded, so the required software must be ordered separately to match the intended control task.