Product Description:

The RD51.1-5N-160-F-LV-FW is a drive controller built by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It is intended for medium-to-large induction motor installations where speed regulation, acceleration ramps, and torque limits are handled by an external power electronics module rather than by the motor starter itself. By modulating the output frequency and voltage delivered to connected machine axes, the unit allows production equipment such as conveyors, pumps, and process lines to maintain set operating speeds while reducing mechanical stress and energy loss during partial-load operation.

This controller delivers a continuous mechanical output of 160 kW for compatible motor applications. Closed-loop regulation is not implemented; instead, it relies on U/f curve control, meaning the ratio of voltage to frequency remains constant over the operating range to maintain motor magnetization. Line supply is accepted as a Converter 3 × AC arrangement, and the input must remain within the 500 V class to stay within the intended semiconductor stress limits. Internal heat is removed through integrated liquid circulation with forced-air cooling; fans move air across heat sinks while an embedded fluid circuit carries the extracted energy to an external heat exchanger, allowing dense cabinet mounting without overheating.

Operation is specified without a built-in brake chopper, so any dynamic braking resistor must be provided by an external module. Diagnostic performance is improved by feedback of cable damping (C3, D3), which helps the controller compensate for long motor leads in large conveyor or crane systems. Control electronics can remain powered during mains outages through an external 24 V stand-by power input, which helps preserve stored settings and fieldbus communication. The hardware corresponds to design generation 1.