Product Description:

The RD51.1-5B-015-D-DF-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. As a converter stage, it conditions a three-phase mains supply, generates controlled voltage and frequency, and governs standard induction motors in material handling, packaging, and process equipment. Within an automation cell, it links the PLC and the motor by executing torque and speed commands while monitoring electrical limits for stable operation. Its compact frame fits multi-axis cabinets where installation space is limited, and it is suited to systems that need consistent motor control across changing process loads.

This controller accepts a three-phase AC input and is designed for networks in the 500 V class. From this supply, it delivers a continuous output of 15.0 kW, which suits medium-sized pumps, fans, and conveyor drives. Flux regulation is handled by U/f curve control, which keeps the voltage-to-frequency ratio constant so the motor can maintain rated torque across the speed range. This control method works well in applications that need dependable speed regulation without a more complex feedback arrangement. A built-in brake chopper redirects regenerated energy during deceleration to an external resistor instead of allowing the DC bus voltage to rise too high.

Thermal loads are removed by a plug-through cooler for units up to 110 kW that places the heat sink outside the cabinet so external air can carry away switching losses. Keeping the heat sink outside the enclosure also reduces the thermal burden on nearby control components. The unit uses design generation 1, and it includes a NAMUR terminal strip with external 24 V standby power to keep safety circuits active when the power stage is off. Status monitoring is supported by current filter feedback on U6, V6, and W6, which provides real-time output current data for control and supervision.