Product Description:

The RD52.1-4N-018-L-V1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. This unit corresponds to design generation 1. The controller conditions three-phase mains power and delivers controlled output to induction or synchronous motors used in conveyors, extruders, and general motion axes. By executing closed-loop current and voltage regulation, it serves as the central interface between the plant’s supply network and the motor, enabling setpoint-driven speed and torque profiles required in industrial automation.

The controller accepts a line voltage between 380 to 480 V and is engineered for motors that demand up to 18.5 kW of mechanical output. Its regulation algorithms employ field-oriented vector control, allowing precise decoupling of flux and torque components during dynamic load changes. Thermal management is handled by forced air cooling, so cabinet airflow must be maintained to keep the heat sink within safe limits. The power stage is built as a three-phase AC converter, meaning rectification, DC-link processing, and inversion are integrated in one frame. For applications that dissipate braking energy externally, the unit is supplied without a built-in brake chopper, so regenerative loads require an external resistor or a separate braking module.

An integrated mains filter attenuates conducted emissions, which helps the controller meet typical plant electromagnetic compatibility limits without additional cabinet components. For control electronics that must remain energized during machine shutdowns, the drive offers 24 V external standby power; this low-energy circuit keeps parameter memory and fieldbus interfaces active while the high-power stage is de-energized. Incoming supply variations of ±10% input tolerance are accepted, allowing the converter to ride through moderate grid fluctuations without tripping and to maintain stable DC-link voltage for the vector algorithm.