Product Description:

The RD52.1-4B-018-L-V1-FW/S133 drive controller is built by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. Classified as a converter for industrial automation, it accepts three-phase mains power and modulates motor voltage and frequency so that motion axes follow programmable references. Generation 1 hardware uses the same digital platform found in other RD52 units, supporting parameter-based setup for conveyor sections, winding stations, or mixing vessels that require repeatable torque output. This arrangement makes the controller suitable for variable-speed motor applications where stable regulation and consistent response are important during normal production cycles.

Its continuous output rating is 18.5 kW, meaning the controller can supply that level of power to a matched motor during standard duty cycles without thermal derating. The input range of 380 to 480 V three-phase AC, with a tolerance of ±10 %, covers common plant distribution levels and allows operation even when the incoming supply varies. Speed and torque are regulated through field oriented vector control, which transforms stator currents into a rotating reference frame so flux and torque-producing components can be controlled independently. A built-in brake chopper directs regenerated energy to an external resistor and helps prevent DC-link overvoltage during rapid deceleration or when lowering vertical loads.

Thermal management relies on forced air cooling, and the internal fan moves airflow across the heat sinks to keep temperature rise within the intended operating range. Line-side harmonics are reduced by an integrated mains filter, which allows the controller to be installed without separate EMC components in many applications. Control electronics remain active through 24 V stand-by power, permitting fieldbus communication and parameter loading even when the main supply is isolated. The power section is arranged as a converter 3 × AC, so the rectifier, DC-link storage, and inverter stages are contained in one housing that simplifies mounting and reduces wiring between the supply and motor terminals.