RD51.1-4B-045-L-F1-FW Bosch Rexroth Indramat
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MPN: R911200624
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The 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.
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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.
Frequently Asked Questions about RD51.1-4B-045-L-F1-FW:
Q: Does the RD51.1-4B-045-L-F1-FW drive controller have an integrated brake chopper?
A: This model includes a built-in brake chopper for effective energy dissipation during braking cycles.
Q: What control type does the RD51.1-4B-045-L-F1-FW use?
A: The RD51.1-4B-045-L-F1-FW utilizes U/f curve control as its primary motor control method.
Q: How is the RD51.1-4B-045-L-F1-FW drive controller cooled?
A: Forced air cooling is used in this drive controller to maintain operational temperatures.
Q: What voltage range can the RD51.1-4B-045-L-F1-FW handle?
A: This drive controller supports input voltages from 380 to 480 V with a tolerance of ±10%.
Q: What is the rated power capacity of the RD51.1-4B-045-L-F1-FW drive controller?
A: The RD51.1-4B-045-L-F1-FW has a rated power output of 45 kW, suitable for medium to high power applications.
