RD51.1-5B-075-D-D1-FW Bosch Rexroth Indramat
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MPN: R911200397
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The Bosch Rexroth Indramat RD51.1-5B-075-D-D1-FW is a drive controller from the RD 500 Drive Controllers series. It supports U/f curve control and features a built-in brake chopper with a plug-through cooler for systems up to 110 kW. This controller operates at a rated power of 75 kW and is designed for 3-phase AC supply with a voltage range of 500 V.
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Product Description:
The RD51.1-5B-075-D-D1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It serves as the power stage between a plant’s automation system and a three-phase induction motor, shaping the applied voltage and frequency so production equipment operates at commanded speeds. In an industrial automation cell, the unit supplies regulated power, executes protective functions, and allows process-specific acceleration or deceleration without mechanical gearbox changes.
This controller uses U/f curve control, meaning the ratio between stator voltage and frequency remains constant over the adjustable speed range. That control method helps maintain magnetic flux and prevent motor saturation during normal operation. The power section uses a three-phase AC converter input, so it is installed on a three-phase bus fed by a rectifier or transformer. Its input is designed for grids that provide up to 500 V, giving compatibility with common distribution levels in manufacturing facilities. Output capability reaches 75 kW, allowing the unit to operate moderate-sized pumps, fans, or material-handling drives from a single enclosure. A built-in brake chopper dissipates regenerative energy during rapid deceleration, which helps avoid DC-bus overvoltage trips without requiring an external braking module.
Thermal losses are removed through a plug-through cooler for ratings up to 110 kW. This heat sink passes through the cabinet wall, so most waste heat is expelled outside the enclosure and airflow demand inside the control panel is reduced. The hardware follows Design Generation 1, using the component layout and connector placement common to this family. Field wiring lands on a NAMUR terminal strip with external 24 V standby power, which keeps the control logic energized when the main supply is disconnected and preserves fault history and communication. The unit uses separately ordered application software, allowing the feature set to match the target machine platform.
