Product Description:

The RD52.1-4N-007-L-NN-P1-P1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. As a drive controller, it interfaces between a plant’s three-phase mains and an AC motor to regulate speed and torque in automated machinery. Within an industrial cell, the unit executes vector-based current regulation, letting motion sections accelerate or decelerate precisely while protecting the attached motor. This operating approach helps the machine respond smoothly to changing process demand instead of running at a fixed output level.

At the power stage, the controller uses a three-phase AC input and is specified for line voltages from 380 to 480 V. The hardware can deviate from nominal mains by ±10 %, so it tolerates moderate fluctuations common in large plant networks. With a continuous output capability of 7.5 kW, it can drive mid-size induction or synchronous motors used on conveyors, pumps, or process axes. Speed and torque are calculated with field-oriented vector control, meaning the microprocessor resolves stator currents into d-q components and maintains magnetic flux independently of load. This control method improves dynamic response and helps the motor hold commanded speed during rapid load changes.

Thermal management relies on forced-air cooling, so installation space must allow unobstructed airflow through the heatsink tunnel. Because the unit is without a built-in brake chopper, external dissipation hardware is required if the connected machine produces regenerative energy during deceleration. Line interference is reduced by the integrated mains filter, making additional RFI components unnecessary in most cabinets. The controller belongs to the generation 1 design, and its option slots are not equipped in this version. That layout leaves room for later expansion through compatible I/O or communication modules if the application requires additional functions.