Product Description:

The RD52.1-4N-055-L-NN-FW belongs to the RD 500 Drive Controllers series developed by Bosch Rexroth Indramat. It serves as the central power stage for variable-speed three-phase motors in automated lines, transforming fixed utility voltage into a controllable output that matches commanded torque and speed profiles. By embedding vector-based current regulation, the controller links PLC motion instructions with the mechanical load, making it a scalable element for packaging, textile, and material-handling equipment. This arrangement lets one controller support steady process speed, controlled acceleration, and repeatable response when the driven machine sees changing load conditions.

Core regulation is achieved through field oriented vector control, which decouples flux and torque so the connected induction motor can respond rapidly to load changes without overshoot. On the power side, the controller delivers up to 55 kW of mechanical output when supplied from industrial lines ranging between 380 to 480 V. The input stage uses a three-phase AC converter, permitting direct connection to symmetrical plant power without a separate input transformer in standard installations. Permissible supply fluctuation is limited to ±10 %, helping the modulation stage remain stable while protecting the power semiconductors from abnormal operating conditions.

Thermal management relies on forced air cooling, with the fan channel positioned to clear heat from the IGBT modules and keep heat sink temperature stable during continuous operation. An integrated mains filter reduces conducted emissions, which helps the drive fit into industrial cabinets without adding a separate line-side filtering stage. The unit is supplied without a built-in brake chopper, so applications with frequent deceleration or high regenerative energy require an external braking path. As a design generation 1 product, its control terminals follow the original RD 500 pinout, which keeps the interface layout consistent with early members of the series.