Product Description:

The RD52.1-4B-090-L-NN-NN-NN-FW is a drive controller from Bosch Rexroth Indramat that belongs to the RD 500 Drive Controllers series. It converts fixed-frequency plant power into a regulated motor output that matches load demand, allowing controlled acceleration, deceleration, and steady-speed operation on automated lines. Through closed-loop current and voltage modulation, the unit supports precise torque control for conveyors, extruders, and similar industrial loads. This operating approach helps connected equipment respond smoothly during process changes and repeated production cycles.

This controller supplies motors with up to 90 kW of mechanical power while operating on a line supply of 380 to 480 V. The input uses a three-phase AC converter input arrangement, allowing direct connection to common industrial distribution panels. Cooling is provided by forced air cooling, which keeps the internal heat sinks within normal temperature limits during continuous full-load duty. The drive uses field-oriented vector control to separate stator current into torque-producing and magnetizing components. That control method improves low-speed response and helps maintain stable motor speed when the load changes.

A built-in brake chopper absorbs regenerated energy during rapid deceleration, protecting the DC bus from overvoltage trips. An integrated line filter reduces conducted interference on the incoming supply, which can reduce the need for extra external EMC hardware in many cabinets. The unit tolerates supply variation of ±10 % around the nominal line value. The electronics use design generation 1 for the initial RD 500 platform. The controller comes without additional function modules, so application-specific communication or feedback options must be added separately.