Product Description:

The RD52.1-7N-110-L-V1-FW/S129 is a drive controller built by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. This AC inverter interfaces with higher-level PLCs to modulate motor speed and current, enabling precise acceleration and deceleration profiles in automated handling, extrusion, and pumping equipment. By converting a fixed DC link supply into variable three-phase output, the unit functions as a central element in energy-efficient, closed-loop industrial motion systems.

It applies field-oriented vector control, meaning the processor continuously resolves stator currents into orthogonal components so that torque and flux are managed independently, giving fast dynamic response at low speeds. Thermal management is handled through forced-air cooling, and airflow across the heat sink must be maintained for rated current delivery and cabinet temperature limits. The controller accepts a DC link between 530 to 670 V, providing headroom for regenerative energy while keeping semiconductor stress within design margins. With a continuous output rating of 110 kW, it can drive high-power motors in extruders or large fans without derating at nominal ambient conditions. The supply type is Inverter DC, indicating that the module depends on an upstream rectifier and is intended for common DC bus installations.

The unit is without a built-in brake chopper, so regenerated energy must be routed to an external resistor or returned to the common bus during deceleration. Control electronics stay active during mains outages through 24 V stand-by power, allowing fieldbus communication and parameter retention until the main DC link is restored. The unit is in Design generation 1, and its mechanical dimensions, connector layout, and diagnostic menus follow the RD 500 Drive Controllers platform. This arrangement is suited to cabinets where the rectifier and inverter are installed as separate modules on a shared DC bus.