Product Description:

The RD51.1-4B-003-L-DF-FW is a drive controller from Bosch Rexroth Indramat in the RD 500 Drive Controllers series. It regulates three-phase induction motors in conveyors, pumps, and other factory equipment by adjusting output frequency and voltage to match process demand. It is intended for variable-speed applications where the motor must respond smoothly to changing load conditions. This approach supports gentle starting, speed adjustment, and stable operation in routine industrial service.

Its continuous output is 3.0 kW, which suits small and medium-duty machines that require steady torque during normal operation. The controller accepts a mains input of 380 to 480 V, and the supply can vary by ±10 % without interrupting normal use. Because the front end uses a 3 x AC converter, the internal DC link is derived directly from the incoming three-phase supply. Motor torque is controlled through U/f curve control, so output voltage rises with frequency to maintain stable motor magnetization through the speed range. This arrangement fits standard industrial power systems, and the product is design generation 1.

For controlled deceleration, the housing contains a built-in brake chopper that dissipates regenerated energy through an external resistor. Thermal management relies on forced-air cooling, with airflow directed across the heat sinks to keep semiconductor temperatures within operating limits. An integrated mains filter reduces conducted emissions, allowing cabinet installation without added external EMC components in many setups. Control wiring is grouped on a NAMUR terminal strip, and an external 24 V standby supply keeps the control electronics active during mains isolation. The unit also reports the status of current filter branches U6, V6, and W6, which supports monitoring of the filtering circuit during operation.