Product Description:

The Bosch Rexroth Indramat RD52.1-4B-003-L-NN-NN-NN-FW is a modular drive controller in the RD 500 Drive Controllers series. It provides closed-loop motor regulation for medium-power axes in automated machinery, where speed and torque must be controlled precisely from the AC mains. The controller sits between a three-phase supply and the motor, shaping current and frequency so that production lines, packaging equipment, and material-handling stations can maintain consistent motion profiles under changing load conditions. It is intended for installations that need repeatable speed changes and stable torque delivery during regular machine operation.

Electrically, the unit accepts a three-phase input in the 380 to 480 V range, so it can be wired directly to common industrial distribution voltages without an external transformer. The front end uses a 3 x AC converter topology and maintains phase symmetry within a ±10 % tolerance, which helps preserve DC-link stability when supply fluctuation is present. Under nominal conditions, the inverter can deliver 3.0 kW of mechanical output to the motor. Regulation is handled by field-oriented vector control, which aligns stator currents with rotor flux for accurate torque response during speed changes, load disturbances, and start-stop cycles.

Thermal performance is handled by forced air cooling, which directs cabinet airflow across the heat sink and removes switching losses from the power section. For rapid deceleration or load back-driving, a built-in brake chopper diverts regenerated energy into a resistor bank, preventing DC-bus overvoltage without requiring an external module. Electromagnetic compliance is improved by an integrated mains filter that reduces conducted emissions on the line side. The controller is part of design generation 1 and is supplied in a basic configuration with the function slots left empty, so the unit focuses on core motion control functions.