Product Description:

The RD52.1-4N-030-D-NN-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It is intended to regulate three-phase induction or synchronous motors in automated machinery, providing closed-loop speed and torque control that integrates with PLC-based plant architectures. By converting fixed-frequency mains power into a variable output, the unit coordinates motor performance with process requirements and helps improve energy utilization in production lines. This makes it suitable for variable-speed duties where stable motor response is needed during load changes.

The controller’s command structure is based on field-oriented vector control, a modulation method that aligns stator currents with rotor flux for fast torque response and accurate low-speed operation. Thermal management relies on a plug-through cooler, so the power section projects through the cabinet wall and expels heat directly to ambient air in installations up to 110 kW. An integrated mains filter attenuates conducted electromagnetic noise, allowing the device to meet commonly applied EMC limits without external line chokes. The inverter section delivers a continuous mechanical output of 30 kW when supplied within the permitted line window of 380 to 480 V. Because the front end is a three-phase AC converter, the module can be connected to standard industrial feeders without a separate transformer while the control electronics maintain a regulated DC bus across that input span.

The unit is shipped without a built-in brake chopper, so regenerative energy must be handled by external circuitry when the application returns power to the drive. Line variations are accommodated by a ±10 % tolerance band that keeps the converter functional during moderate supply fluctuations. The unit is design generation 1.