Product Description:

The RD52.3-8C-075-L-LV-FW is a drive controller produced by Bosch Rexroth Indramat and delivered within the RD 500 Drive Controllers series. It serves as the closed-loop interface between a DC bus and an induction or synchronous motor, translating process commands into precise torque and speed values for industrial automation axes. By combining high-speed signal processing with vector regulation, the unit allows production machinery to accelerate, decelerate, and hold velocity under varying mechanical loads without external relays or contactors.

This controller employs field-oriented vector control to decouple flux and torque, so the connected motor responds linearly to current references even at low speed. Heat generated by the power section is removed through forced air cooling, permitting continuous output up to 75 kW without thermal derating when ambient airflow is maintained. The internal DC link is fed from an Inverter DC supply, and the power stage is designed for a nominal bus voltage of 700 V, which aligns it with common regenerative front ends in large automation cells. When configured to operate as RD51 SFT, the controller maps standard SFT command words to the RD52 hardware, allowing migration from earlier installations.

The SFT inverter layout integrates power terminals, control slots, and diagnostic LEDs on a single heat-sink frame. A dedicated auxiliary input provides 24 V stand-by power, so fieldbus monitoring and fault memory remain active when the main bus is de-energized. The generation 3 design also incorporates selectable cable damping feedback in C3 and D3 form to compensate for long motor leads and help prevent reflected-wave overvoltage. Application software is ordered as a separate subposition, allowing the drive to be matched to the required function package without replacing the entire unit.