Product Description:

The RD51.1-4N-200-R-V1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It works between a three-phase mains supply and an induction motor, regulating speed and torque for conveyors, mixers, and other plant equipment that require stable motor control. The unit belongs to design generation 1, which places it in an early version of the platform intended for high-power cabinet installations where continuous operation is common. Its architecture is suited to centralized control systems that serve larger process machines and long daily operating cycles.

This model delivers a rated output of 200 kW, which is suitable for sizable production motors in continuous-duty service. It accepts line voltages from 380 to 480 V through a three-phase AC converter input, and the allowable supply variation is limited to ±10 %. That range supports common industrial power systems without requiring a narrowly fixed incoming supply. Heat is removed by liquid cooling with an internal pump, so the controller can be used in cabinets where free air circulation is limited. An integrated mains filter reduces conducted interference on the supply side and helps keep nearby automation hardware less affected by electrical noise.

Speed control uses U/f curve control, which keeps the voltage-to-frequency relationship appropriate for standard induction motors. The drive comes without a built-in brake chopper, so braking energy must be handled by external hardware when fast deceleration is required. In applications with frequent stops, a separate resistor or regenerative unit can manage returned energy from the motor. For control retention during mains isolation, the unit supports 24 V standby power from an external source so stored parameters and diagnostic functions can remain available.