RD51.1-4B-045-L-F1-FW Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
MPN: R911200624
Ask for AvailabilityThe Bosch Rexroth Indramat RD51.1-4B-045-L-F1-FW is a drive controller from the RD 500 Drive Controllers series with a rated power of 45 kW. It features a built-in brake chopper and uses forced air cooling. The unit supports a voltage range from 380 to 480 V and integrates a mains filter for converter 3 x AC supply.
Internal Product Review
The RD51.1-4B-045-L-F1-FW is a Bosch Rexroth Indramat drive controller with 45 kW rated power and a converter 3 x AC supply. U/f curve control and an integrated mains filter support stable drive behavior and cleaner cabinet integration in variable-speed applications. A built-in brake chopper with forced air cooling makes this unit a strong choice for demanding industrial drive systems.
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Product Description:
The RD51.1-4B-045-L-F1-FW is a drive controller manufactured by Bosch Rexroth Indramat and supplied within the RD 500 Drive Controllers series. As a closed-loop power stage, the unit converts three-phase mains energy into regulated motor voltage and frequency so that induction motors can match the speed and torque demands of automated machinery, conveying modules, or process lines. By modulating voltage along a volt-per-hertz profile, the controller supports constant-flux operation across a broad speed range while allowing programmable limits for current, acceleration, and braking. It is suited to applications that need adjustable motor speed without separate feedback hardware.
The drive outputs a continuous mechanical reference of 45 kW, which is suitable for medium-frame motors used on pumps, mixers, and material-handling axes. Its input terminals accept three-phase mains from 380 to 480 V, and the inverter operates properly as long as line variation remains within ±10 %. A 3 x AC converter supply topology supports the DC link and can handle regenerative energy returned from the motor during deceleration. To control rotor flux without encoder feedback, the unit uses U/f curve control, which adjusts output voltage in proportion to commanded frequency. This control method is commonly used where steady speed control and straightforward motor matching are required. Dynamic stopping energy is diverted through the built-in brake chopper, which helps prevent overvoltage in the DC bus and reduces the need for an external braking module.
An integrated mains filter suppresses high-frequency emissions, which can help the cabinet meet typical factory EMC limits without extra line reactors. Thermal management is handled by forced air cooling, with axial fans moving air across the heat sink so the controller can operate at full load in a sealed panel. The fan-driven airflow carries heat away from power semiconductors during sustained operation under load. Protective logic also samples motor phase currents through the current-filter feedback (U6, V6, W6) function, improving trip accuracy during short-circuit or ground-fault events. This current monitoring supports stable protective response when load conditions change rapidly.
