Product Description:

The RD51.1-8N-005-L-V1-FW is manufactured by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. Within an automation line, this device converts fixed DC link power into adjustable AC output so induction motors can follow speed and torque commands issued by a PLC or motion controller. The integrated housing combines the power electronics, control board, and field I/O, which helps keep cabinet wiring orderly and reduces the number of separate modules around the drive. This arrangement suits variable-speed duties in production equipment where stable motor control and compact panel layout are both important.

Motor regulation is performed with U/f curve control, an open-loop method that maintains the ratio between applied voltage and frequency so magnetic flux stays stable across the working range. Internal components are cooled by forced air cooling, so airflow through the heat-sink tunnel must remain unobstructed during operation. The inverter section can deliver a continuous output of 5.5 kW, which is suitable for pumps, conveyors, and small extruders. Its DC bus expects an inverter DC supply, allowing integration into common DC link installations instead of separate rectifier sections. Dynamic braking energy is not dissipated internally because the unit is supplied without a built-in brake chopper, so rapid deceleration of high-inertia loads requires an external resistor module.

This model is in design generation 1, placing it in the first RD 500 product revision. Control circuitry remains active through a 24 V standby power feed, so parameter memory and fieldbus communication can remain available when the main link is de-energized. Connection to a plant-level DC grid is permissible up to 700 V, which supports shared bus operation with higher-power drives. The unit requires separate firmware matched to the selected function package.