Product Description:

The RD51.1-5N-030-L-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. This unit forms the power conversion stage between a three-phase utility supply and asynchronous motors used in conveyors, mixers, and fan arrays. By providing adjustable voltage and frequency, it lets a PLC or local keypad match motor speed to process demand, reducing mechanical stress while maintaining stable torque in continuous industrial operation.

The controller executes motor regulation with U/f curve control, a method that keeps the voltage-to-frequency ratio constant so the magnetizing flux inside the motor remains steady over the speed range. Thermal management relies on forced air cooling; an internal fan drives cabinet air across the heat sink, allowing the electronics to dissipate switching losses without external liquid circuits. The power stage is sized for a continuous output of 30 kW, making it suitable for medium-sized production machinery that runs for long shifts. Mains connection is handled as a three-phase AC converter, with all three phases rectified and then inverted to a variable-frequency waveform. The input section is designed for a supply window centered on 500 V, so the surrounding electrical equipment must be rated for that voltage class.

This unit ships without a built-in brake chopper, meaning dynamic braking energy must be routed to an external resistor or allowed to flow back to the grid during rapid deceleration cycles. Classified as Design Generation 1, it shares mechanical dimensions and connector layouts with other first-generation RD 500 devices. The control board requires firmware to be ordered separately rather than being included with the hardware. The unit is not equipped with application-specific software functions, leaving the control platform open for the required machine features only.