Product Description:

The RD51.1-5N-110-W-V1-FW is a drive controller manufactured by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. Designed as the central power stage in variable-speed AC motor installations, it converts fixed mains voltage into a regulated, adjustable-frequency output that controls shaft speed and torque. It integrates with higher-level PLCs and serves applications such as material transport lines, mixers, and processing machinery where precise electrical control replaces mechanical throttling.

This model uses a three-phase AC converter supply architecture; it draws balanced three-phase power, rectifies it, and reconstructs an adjustable waveform for the motor. Internal components are dimensioned for a nominal DC link derived from a 500 V mains supply, and the required creepage distances help prevent electrical breakdown. A continuous capability of 110 kW allows it to drive large pumps or extruders under steady load. Speed and flux are handled through U/f curve control, a scalar method that keeps magnetizing current proportional to frequency. This approach avoids complex vector algorithms and still provides adequate torque in the lower speed range, making the unit practical for retrofit projects that retain legacy motors.

Heat generated by the IGBTs is removed through liquid cooling, and the closed coolant loop helps limit cabinet temperature and airborne contamination. The unit comes without a built-in brake chopper, so applications with frequent deceleration or overhauling loads require an external braking package. An optional 24 V standby power channel keeps the control electronics active during brief power interruptions, allowing fieldbus communication and alarm logging to continue. The hardware is categorized as Generation 1, which matches the first-release RD peripheral modules. The control software is ordered separately, allowing the function set to be matched to the target machine.