Product Description:

The RD52.1-7N-075-L-V1-FW is a drive controller produced by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. Installed within the DC link of an inverter cabinet, it modulates current and voltage to run AC motors used in packaging lines, material-handling stations, and process equipment. By executing closed-loop regulation routines, the unit supplies precisely timed pulses that align motor speed and torque with command values issued by a higher-level PLC. This allows the connected motor to accelerate, decelerate, and respond to changing load conditions with stable control.

This model is powered from an inverter DC link and accepts a DC bus voltage between 530 to 670 V, allowing it to connect to appropriately sized rectifier systems in industrial installations. At a rated output of 75 kW, the controller can drive large induction or synchronous machines in continuous duty. Motion accuracy is maintained through field-oriented vector control, which separates stator current into flux-producing and torque-producing components for fast response and stable regulation. Internal thermal limits are managed by forced air cooling, and the airflow carries heat away from the power semiconductors so full load operation can be maintained within the intended ambient range.

The unit is delivered without a built-in brake chopper, so deceleration energy must be handled by an external chopper or regenerative module when high-inertia loads are present. The unit is in design generation 1, which matches first-generation RD 500 accessories. Control electronics remain active during plant outages through a dedicated 24 V standby power input, permitting communication and parameter retention while the main bus is de-energized. The operating software must be ordered as a separate subposition, allowing the controller to be matched to the required control functions and installed option cards.