Product Description:

The RD52.1-7N-045-L-LV-FW is a drive controller produced by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. As a closed-loop inverter stage, it interfaces between a DC link and three-phase motors, providing precise speed and torque regulation for conveying systems, packaging machines, and other automated stations that demand vector-based control. It is intended for applications that use a shared DC bus and need stable motor performance during changing loads. In automated lines, it can serve as the regulated power stage for axes that require repeatable acceleration and controlled running speed.

This unit delivers a continuous mechanical output of 45 kW, so it can operate medium-power induction or synchronous motors without derating. The DC link accepts between 530 to 670 V, allowing the controller to run on high-energy intermediate circuits typically found in common-bus installations. Power reaches the inverter through an inverter DC supply path rather than from a direct mains feed, which simplifies regenerative schemes. Motor regulation is executed with field-oriented vector control, which resolves stator currents into flux-producing and torque-producing components for dynamic response across the speed range. Internal heat is extracted by forced air cooling, so cabinet airflow must be maintained for full current capability. The unit operates without a built-in brake chopper, so large regenerative loads require an external braking resistor or a separate chopper module.

The unit also includes service features that complement the core ratings. An auxiliary line for external 24 V standby power keeps the control electronics active during supply isolation for parameter access or fieldbus monitoring. Drive diagnostics include cable-damping feedback (C3, D3), a function that measures motor-lead impedance so the regulator can compensate for long cable runs. This helps maintain stable control behavior when the motor is installed at a greater distance from the controller.