Product Description:

The RD43.1-4R-185-R-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat and supplied within the RD 500 Drive Controllers series. Intended for high-power industrial automation, the unit converts three-phase mains energy into controlled AC output for synchronous or induction motors used on presses, extruders, and large conveyor systems. By integrating control electronics with power conversion hardware, it supplies regulated torque and speed commands that coordinate motion sequences in plant-wide networks. This arrangement supports centralized control of heavy-duty motor applications while keeping the power section in one unit.

This model delivers a continuous output of 185 kW, allowing it to support large-frame motors without external parallel drives. The incoming three-phase line can vary from 380 to 480 V, so the controller fits common industrial feeders used in many regions. Its 3 x AC converter supply topology rectifies the mains voltage and produces a variable-frequency AC output, which keeps motor speed matched to process demand. Thermal energy generated by the power stage is removed through liquid cooling with an internal pump; this closed loop prevents heat buildup inside cabinets when the unit is installed in dense drive arrays. An enclosure rating of IP20 limits dust ingress while still requiring installation inside a protected electrical room, and it allows access to terminals and bus connections.

Recovery energy from decelerating loads is routed back to the DC link because the unit is supplied without a brake chopper. This arrangement suits processes in which large rotating loads regularly return energy during slowdown. A factory-installed line filter is integrated to reduce conducted emissions and meet EMC thresholds without extra modules. Component tolerances of ±10 % help maintain stable regulation when mains voltage drifts or when temperature affects semiconductor characteristics. The controller belongs to design series 1 within the RD 500 platform.