Product Description:

The RD51.3-8C-075-D-V1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Installed between the common DC bus and the motor terminals, it modulates three-phase output to regulate asynchronous machines in material-handling and process lines. By supplying adjustable frequency and voltage, it lets the system match motor torque to load demand, which can reduce power draw and mechanical wear while fitting the standardized hardware footprint used throughout the RD 500 series.

This model applies U/f curve control, so the voltage-to-frequency ratio stays constant across the speed range and helps prevent magnetic saturation in the motor. Thermal management is handled by a plug-through cooler rated for units up to 110 kW, and the heat sink projects through the panel wall to remove waste heat directly to an external airflow path. The controller belongs to design generation 3, which offers refined parameter handling and deeper diagnostics than earlier versions. Its traction capability reaches 75 kW of motor power from a DC link that can energize a 700-volt bus, and the inverter accepts a line filter tuned for a nominal input of 700 V for high-power plant layouts.

An external auxiliary supply provides 24 V standby power, keeping the control electronics active for fieldbus monitoring even when the main link is isolated. During operation, the unit uses the RD51 SFT operating profile, matching the SFT inverter topology stated for the product variant and unit configuration. The DC source classification is Inverter DC, which indicates that the power components are arranged for a common bus system rather than direct mains rectification. The application software is ordered as a separate subposition, so the required feature set can be selected without replacing the hardware.