Product Description:

The RD52.1-4N-011-L-NN-FW drive controller is manufactured by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. Within an automation cell, it serves as the closed-loop power stage between the supply network and an AC motor, adjusting voltage and frequency so commanded motion profiles are executed precisely. The unit supports integration with programmable controllers for tasks that require repeatable speed, positioning, or torque regulation across conveyors, pumps, or material-forming equipment. This arrangement helps the controller respond to changing load conditions while maintaining stable motor operation during normal machine cycles.

At the control layer, the device uses field-oriented vector control, separating stator current into flux and torque components for fast dynamic response. This method improves torque response at low speed and helps the motor remain steady as operating demand changes. The power section accepts line voltages from 380 to 480 V and tolerates deviations of ±10 %, helping it remain stable during moderate supply swings. Supplied as a 3 × AC converter, it rectifies the three-phase line input and then recreates a variable output waveform that matches process demands. An integrated mains filter limits conducted noise, allowing installation without external filtering hardware.

Thermal management depends on forced air cooling, which channels airflow across heat-sink fins to keep semiconductor temperatures within allowable limits. Because the hardware comes without a built-in brake chopper, regenerated energy during rapid deceleration must be handled by an external resistor or returned to the grid. This is especially important in applications with frequent stops, reversing motion, or high-inertia loads. The controller belongs to Generation 1, so its mechanical dimensions and terminal assignments follow the first release of the RD 500 platform. No optional functions are equipped, leaving the unit focused on its standard power-conversion and closed-loop control tasks.