Product Description:

The RD52.1-4N-110-L-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It regulates three-phase motors in automated equipment by converting fixed mains power into variable frequency and voltage output that follows real-time vector commands. Through its converter topology, the unit connects directly to industrial distribution networks and serves as a central actuator for motion axes, pumps, extruders, and other continuous-process machinery that require coordinated speed and torque control. Its operating concept is suited to applications where stable motor response is needed across changing load conditions and sustained duty cycles.

The input accepts 380 to 480 V, and a tolerance band of ±10 % allows the drive to continue operating through normal supply variation. The power stage can deliver 110 kW continuously, which suits high-demand equipment that must hold output over long production runs. As a 3 × AC converter, it draws power from all three phases, and field-oriented vector control lets the drive regulate flux and torque independently for fast response at changing speeds. Thermal losses are removed by forced air cooling, with internal airflow directed across the heat sink to maintain output without liquid cooling equipment.

The power section operates without a built-in brake chopper, so regenerative applications need an external braking solution when returned energy must be dissipated. Conducted emissions are reduced by an integrated mains filter, which simplifies cabinet layout by removing the need for a separate line-conditioning unit. The controller is in design generation 1, and application-specific functions are added through external I/O or safety modules rather than through built-in option packages. This arrangement keeps the base unit focused on power conversion while allowing the surrounding system to supply any extra interface or protection functions required by the machine.