Product Description:

The RD52.1-4N-005-L-NN-P1-NN-FW drive controller is produced by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. Within an automation line, it forms the link between a plant’s three-phase power bus and the AC motor, generating regulated voltage and frequency patterns so that the driven axis follows commanded speed or torque references with high accuracy. This functionality makes the unit suitable for material handling, packaging, or process equipment where reliable vector control and real-time response are required during startup, steady operation, and changing load conditions.

The controller is designed for a supply network of 380 to 480 V, a range that covers common industrial 400 V systems and allows installation without a step-up transformer. Its power module delivers a continuous mechanical output of 5.5 kW, matching medium-duty pumps, fans, conveyors, or indexing stations. The input side uses a 3 x AC converter arrangement, meaning all three incoming phases are rectified and regulated internally before power is delivered to the motor section. Line variations up to ±10 % are tolerated by the DC link, helping prevent nuisance trips during supply sag or swell events. Closed-loop regulation is executed with field-oriented vector control, which separates flux and torque components to maintain dynamic response even at low shaft speeds.

Thermal management relies on forced-air cooling, so cabinet airflow passes across the heat sink and supports rated operation without external chillers. To reduce conducted emissions, an integrated mains filter attenuates high-frequency noise at the supply terminals and helps limit interference on connected line conductors. The power stage operates without a built-in brake chopper, so an external resistor is required when regenerative braking energy must be dissipated. Classified as design generation 1, the device follows the original RD 500 hardware layout. The optional function expansion slot is not equipped.