Product Description:

The RD52.1-4B-055-L-NN-FW is a controller module manufactured by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. Installed between a plant’s three-phase supply and an AC motor, it adjusts voltage and frequency so that motion can be tuned for throughput, accuracy, and energy use in automated equipment. Its housing accepts pluggable option cards, which allows the unit to be adapted for application-specific control or interface needs. The enclosure also supports cabinet airflow management so heat produced during operation can be directed away from sensitive internal parts.

The rated output reaches 55 kW, enabling the controller to supply medium-power motors in industrial drive systems. It is designed for a line voltage range of 380 to 480 V and connects to the mains through a three-phase AC converter front end. Within that range, the unit can operate with ±10 % mains variation without derating. Torque and speed are regulated by field-oriented vector control, a closed-loop method that separates stator current into flux-producing and torque-producing components for accurate dynamic response. This control method helps the drive maintain smooth acceleration and stable motor behavior when the load changes during operation.

Thermal management relies on forced air cooling, with an internal fan moving cabinet air across the heatsink channels to keep semiconductor temperatures within an acceptable range. During rapid deceleration, energy is absorbed by a built-in brake chopper, so the drive can manage regenerated energy without separate switching hardware. Line-side disturbances are reduced by an integrated mains filter, which helps limit conducted emissions on the incoming supply. The hardware is identified as design generation 1, and the NN code indicates that no additional technology functions are included. Power components and control boards use the same dimensional layout, which helps maintain a consistent cabinet arrangement.