Product Description:

The RD52.1-4N-022-L-V1-FW is a drive controller manufactured by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. It acts as the power conversion and regulation stage between the plant mains and three-phase motors, delivering closed-loop control of speed and torque for automated equipment. This model belongs to design generation 1, so it follows the housing and connection pattern used within that generation. That arrangement supports orderly cabinet layouts and consistent integration with other compatible drive components used in the same machine.

The controller is supplied from a three-phase AC supply and can operate over a mains voltage range of 380 to 480 V. This input range matches common industrial power systems used for motion and process equipment. It tolerates line variations of up to ±10%, helping the drive remain stable during normal plant supply fluctuation. Its power stage delivers a continuous output of 22 kW, which suits medium-capacity pumps, fans, and conveyor drives. Internal heat is removed through forced air cooling, so clear airflow paths above and below the heat sink are needed during installation.

Motor regulation is performed with field-oriented vector control, allowing precise torque production even at low speeds and smoother response during changing load conditions. This control method gives the motor better low-speed behavior than simpler open-loop approaches. Conducted emissions toward the supply are reduced by an integrated mains filter, which can reduce the need for separate line-side filtering components in many installations. Control electronics remain energized during mains loss through an external 24 V standby power supply, preserving parameter states and supporting a quick restart. The unit comes without a built-in brake chopper, so regenerative energy must be handled by an external braking resistor when the application returns power to the drive.