Product Description:

The RD51.1-5B-015-D-D1-FW is an AC drive unit built by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. It converts fixed-frequency three-phase power into a variable output that lets automation systems match motor speed to process demand. By modulating voltage and frequency, this device supports conveyors, pumps, and general-purpose machinery that rely on continuous speed control and improved energy use in industrial plants.

A key feature is the integrated built-in brake chopper, which directs regenerated energy to a resistor so overvoltage is avoided during rapid deceleration. Speed regulation is performed through U/f curve control; the controller maintains a constant volts-per-hertz ratio, making it suitable for standard squirrel-cage motors without encoder feedback. Thermal management is handled by a plug-through cooler for outputs up to 110 kW that passes the heat sink through the panel wall, helping keep sensitive electronics inside the cabinet at lower temperatures. The unit delivers a continuous mechanical output of 15.0 kW, allowing it to drive mid-range production equipment on assembly or material-handling lines. Compatibility with a supply window centered on 500 V three-phase mains allows direct connection in facilities that use higher industrial voltages without an upstream transformer.

The power stage is configured as a converter 3 x AC unit, which rectifies line input and recreates an adjustable AC waveform for the motor terminals. Classified as design generation 1, this hardware revision uses the same option slots and mounting dimensions as other early RD51 controllers. The control interface follows the NAMUR terminal strip convention, which provides standardized numbering and signal allocation. A dedicated external 24 V stand-by power connection keeps the control logic and fieldbus active when the main power section is locked out, permitting parameter access and network communication during safety interlocks.