Product Description:

The RD52.1-4B-200-F-NN-FW is a drive controller from Bosch Rexroth Indramat in the RD 500 Drive Controllers series. It regulates high-power three-phase motors in production lines, conveyors, and process equipment where stable speed and torque control are required. By converting incoming line power into a controlled AC output, the unit serves as the electrical link between the supply and the driven machine. That role makes it suitable for applications that must hold process speed accurately during acceleration, deceleration, and changing load conditions.

This controller uses a three-phase AC converter input topology. Its nominal input range is 380 to 480 V, and it can tolerate supply variation of ±10% without derating. The power stage is rated at 200 kW, which supports continuous operation with appropriately matched motors in demanding applications. It uses field-oriented vector control to regulate torque-producing and magnetizing current components, helping the drive maintain responsive control during startup, steady running, and load changes. The available input window also helps the controller remain stable where normal plant voltage fluctuation is present.

Thermal management uses forced-air cooling with integrated liquid circulation, so internal heat is transferred through a heat exchanger connected to an external coolant loop. A built-in brake chopper handles regenerated energy during deceleration, which reduces the need for separate braking hardware in many systems. The unit also includes an integrated mains filter to reduce conducted electrical interference on the line side. This cooling arrangement helps the drive manage high continuous output in enclosed industrial installations. The controller belongs to Design generation 1, identifying the first design generation of this model platform.