Product Description:

The RD52.1-5B-315-F-V1-FW is a drive controller developed by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It regulates three-phase induction or synchronous machines in automated plants, providing the speed and torque control required for conveyors, extruders, winders, pumps, and other driven equipment that must respond smoothly to changing production conditions. By converting fixed mains power into a variable-frequency, variable-voltage motor output, the unit adjusts motor behavior to match process demand, supports controlled acceleration and deceleration, and can link to higher-level PLCs through its standard interface.

Rated for 315 kW, the controller can operate large-frame motors in high-power applications where continuous process duty is common. Its DC link is designed for supplies up to 500 V, and the main input uses a three-phase AC converter topology that rectifies incoming power before inverting it for the motor. Motion control uses field-oriented vector control, which manages motor flux and torque separately for faster response, better low-speed behavior, and steadier performance when the load changes suddenly. Heat is removed by forced-air cooling with integrated liquid circulation, so internal airflow cools the power section while a liquid loop transfers heat outside the cabinet and helps maintain thermal stability in enclosed installations.

A built-in brake chopper dissipates regenerated energy during rapid deceleration, which helps prevent DC-link overvoltage during braking events and supports frequent speed changes in process equipment. Control electronics can remain active from an external 24 V standby power source during mains interruptions, allowing communication and shutdown functions to continue long enough for an orderly stop instead of an abrupt loss of control. The unit is part of design generation 1, so its mechanical dimensions and connector placement follow the first RD 500 release and fit panels already arranged for that platform.