Product Description:

The RD52.1-4B-022-L-V1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It converts three-phase mains power into a regulated output for induction or synchronous motors, allowing precise speed and torque regulation in automated production lines. Acting as a closed-loop component, it exchanges setpoints and status data with higher-level PLCs so machining centers, conveyors, or packaging equipment maintain accurate motion under variable process demands. This operating role makes the unit suitable for machine sections that must respond smoothly to changing loads without unstable speed variation.

For the power section, the unit is rated at 22 kW, which is the maximum continuous output it can deliver to a connected motor. It accepts line voltages from 380 to 480 V, and all inputs may deviate by up to ±10 % without derating, which supports use on common industrial supply systems with moderate voltage variation. The front end uses a three-phase AC converter, so the controller rectifies and inverts three-phase power rather than relying on a single-phase supply. Harmonic attenuation on the supply side is supported by an integrated mains filter, which helps reduce conducted emissions and simplifies cabinet wiring. This combination supports straightforward integration into standard low-voltage plant power distribution.

To support that electrical load, the enclosure uses forced-air cooling, and its internal fan system directs airflow across heat sinks to keep semiconductors within their thermal limits during repeated accelerations. A built-in brake chopper dissipates regenerated energy and helps prevent DC-bus overvoltage when the motor decelerates heavy loads. Motion control is handled through field-oriented vector control, which supports fast current response and accurate torque production across the speed range. For service access or controlled shutdown tasks, the controller can remain active through 24 V standby power supplied externally. This allows the control electronics to stay available even when the main power section is not energized.