Product Description:

The RD51.1-7N-160-R-V1-FW drive controller is produced by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. It modulates the voltage and frequency delivered to medium- and high-power induction motors used in conveyors, mixers, and other automated plant equipment. By converting direct current from a common DC bus into a regulated three-phase output, the unit supports centralized multi-axis systems and provides stable speed control for industrial automation. This operating method is well suited to installations where several drives share power infrastructure and where efficient motor regulation is required during continuous process duty.

The controller operates with a DC link input between 530–670 V, which matches rectifier sections supplied from 400–480 V mains. Within this range, it can deliver its full 160 kW rated output to the motor terminals. Speed regulation uses U/f curve control, which keeps the voltage-to-frequency ratio constant across the operating range and suits fans, pumps, and similar variable-speed loads. Thermal management uses liquid cooling with an internal pump, which removes losses without adding as much heat to the cabinet air as air-cooled designs. Power is supplied through an inverter DC supply, allowing the drive to operate from a common DC bus with compatible braking or regeneration modules.

The unit is supplied without a built-in brake chopper, so excess energy must be handled by an external resistor or a regenerative device connected to the DC bus. It is in generation 1, which identifies the product generation used for this controller. For control backup during mains isolation, the unit accepts 24 V stand-by power from an external source so logic circuits can remain active while the main power stage is off. This support voltage helps maintain diagnostics and communication functions when the motor output is disabled.