Product Description:

The RD43.1-4R-185-W-NN-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It serves as the power conversion core between a three-phase supply and motor groups in automated presses, extruders, and process lines where accurate speed regulation is required. By rectifying the incoming AC and maintaining a regulated DC link, the device lets downstream inverter modules command multiple axes with consistent dynamic response. The unit is part of Generation 1 and shares mounting dimensions and bus connectors with other units in the series, which helps simplify cabinet layout.

The controller has a continuous rating of 185 kW, which is the maximum real power it can channel to the DC bus without derating. The input stage accepts line potentials from 380 to 480 V, fitting common low-voltage networks used worldwide. A 3 x AC converter rectifies the three-phase mains, and the resulting losses are removed through liquid cooling, allowing dense stacking inside sealed panels. The enclosure is rated IP20, so the device needs installation in a cabinet that prevents finger contact and dripping liquids. The unit is supplied without optional technological functions, so application-specific motion features must reside in the supervisory control.

Stable operation is maintained when the line voltage varies by ±10 %, which helps reduce trips in installations with erratic utility service. A factory-installed integrated mains filter suppresses conducted interference, so external RFI components are unnecessary in many applications. The power section ships without a brake chopper, so regenerative energy is routed back to the grid during deceleration. Control logic is activated only after loading the board with separate firmware ordered under its own material number, allowing the software revision to match the rest of the control platform.