Product Description:

The RD51.1-5B-045-L-NN-FW is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It works as a drive controller between a three-phase mains source and an induction motor, adjusting speed and torque along a voltage-to-frequency curve for conveyors, pumps, and similar equipment. This allows machines that normally run at a fixed electrical frequency to operate over a controlled speed range when process demands change. By varying output frequency and corresponding voltage, it can moderate acceleration and reduce abrupt mechanical loading on belts, fans, and pump trains. That makes it suitable for applications where smoother starts and adjustable operating speed are more useful than simple across-the-line motor operation.

This unit delivers a rated output of 45 kW, so motors drawing up to that mechanical power can be regulated without derating. It accepts line voltages centered on 500 V, matching medium-voltage factory grids. The power input is listed as Converter 3 × AC, indicating that the controller is intended for a three-phase converter supply. Speed regulation uses U/f curve control, which keeps stator flux approximately constant by reducing voltage as frequency decreases. Heat from semiconductors and magnetic components is removed by forced air cooling, so cabinet airflow must remain unobstructed to keep internal temperatures within allowable limits.

A built-in brake chopper is integrated, allowing surplus regenerative energy to be dissipated through an external resistor during rapid deceleration or overhauling loads. The hardware belongs to design generation 1, and the unit is classified as a Drive Controller. Its feature set is not equipped with application-specific functions such as positioning or PID process control. The final function depends on the software package installed for the intended motion or process task.