Product Description:

The RD51.1-4B-055-L-NN-FW from Bosch Rexroth Indramat belongs to the RD 500 Drive Controllers series and is used with induction motor systems in automated plant lines. As a drive controller, it adjusts output voltage and frequency so connected machinery can run at the commanded speed while staying within normal torque limits for the application. This makes it suitable for equipment such as conveyors, pumps, and fans that need dependable variable-speed operation in industrial settings. Its housing and interface layout match other RD51 units, which helps keep cabinet arrangements consistent across related installations.

The unit delivers a continuous output of 55 kW from a mains input of 380 to 480 V three-phase power. It continues to operate within its stated range when the supply varies by ±10%, which helps it tolerate moderate line fluctuation. The internal power stage uses a 3 x AC converter arrangement with a diode front end and an IGBT output section. Control is based on U/f curve control, which increases stator voltage in step with frequency during normal speed changes. Because this method follows a straightforward voltage-to-frequency relationship, it is well suited to general-purpose induction motor duties that do not require closed-loop vector regulation.

A built-in brake chopper handles regenerated energy through an external resistor during rapid deceleration. Thermal stability is supported by forced air cooling, and the airflow path matches the housing arrangement used for design generation 1. An integrated mains filter reduces conducted interference on the incoming power line and helps limit electrical noise entering the cabinet. The base unit is supplied without optional function cards, so any application-specific interfaces or added control features must be selected separately.