Product Description:

The RD51.1-4N-004-L-C1-FW is a drive controller manufactured by Bosch Rexroth Indramat and included in the RD 500 Drive Controllers series. As a converter-based unit, it regulates three-phase induction motors in automated plant equipment, allowing a PLC or fieldbus system to command speed and torque without mechanical speed variation. This arrangement suits applications such as conveyors, pumps, and mixers, where stable motor control helps the machine follow process changes while maintaining coordinated operation. Because the drive varies electrical output instead of relying on fixed mechanical adjustment, the connected motor can better match changing load demands during routine plant operation.

This controller uses U/f curve control, so stator voltage tracks output frequency to maintain near-constant motor flux across the normal operating range. It accepts mains from 380 to 480 V and uses a Converter 3 x AC front end, which supports operation on common 50/60 Hz industrial supplies within that voltage window. Component ratings allow input variation of ±10 %, which helps the unit remain compatible with lines that do not hold a perfectly steady nominal voltage. An integrated mains filter suppresses conducted emissions and reduces the need for external line-filter hardware.

Thermal management relies on forced air cooling, so a dedicated fan moves air across the heat sink and the surrounding panel space must remain clear for airflow. The drive comes without a built-in brake chopper, which means braking energy from fast deceleration must be handled by an external module when the application regenerates power. A control supply of 24 V standby power keeps the electronics active during main-power isolation on supported frame sizes, which helps communication and control functions remain available. The unit belongs to Design generation 1.