RD51.1-4B-075-L-L1-FW Bosch Rexroth Indramat
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MPN: R911201256
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The Bosch Rexroth Indramat RD51.1-4B-075-L-L1-FW is a drive controller in the RD 500 Drive Controllers series. It features a rated power of 75 kW, U/f curve control, and operates on a voltage range from 380 to 480 V with a built-in brake chopper. The controller uses forced air cooling and comes with an integrated mains filter.
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Product Description:
The RD51.1-4B-075-L-L1-FW is a drive controller produced by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. In an automation cell, it provides closed-loop regulation for three-phase induction motors, matching motor torque and speed to process demands while coordinating with higher-level PLCs. By converting incoming AC power and issuing precise voltage-frequency profiles, the unit links the plant supply to mechanical motion in conveyors, mixers, and other continuous-duty machines. This makes it suitable for process equipment that must maintain steady speed under changing load conditions.
This controller delivers a continuous mechanical output of 75 kW, giving it capacity for medium-to-large motors in pumping or extrusion tasks. It is designed for a mains window of 380 to 480 V and can tolerate line fluctuations of up to ±10 % without derating, which helps maintain operation on industrial feeders subject to load swings. The controller uses a Converter 3 x AC supply arrangement, and the internal rectifier section builds the DC link from a three-phase source so no external converter is needed. Conducted emissions are reduced by an integrated mains filter, which can simplify cabinet installation. The wide input range also supports installation in facilities with nominal 400 V or 460 V distribution.
A built-in brake chopper dissipates regenerated energy during fast deceleration, protecting the DC bus from overvoltage and eliminating the need for an external braking module. Motor flux is controlled through U/f curve control, a method suited to standard induction machines where sensorless speed regulation is adequate. Thermal management relies on forced air cooling, with axial fans moving cabinet air across heat sinks to keep semiconductor temperatures within limits. Diagnostic functions include feedback of cable damping (C3, D3), enabling the drive to monitor motor-side resonance and adjust gating patterns for more stable torque delivery over long cable runs. This arrangement is useful where deceleration events return energy from high-inertia loads.
Frequently Asked Questions about RD51.1-4B-075-L-L1-FW:
Q: Does the RD51.1-4B-075-L-L1-FW drive controller feature a brake chopper?
A: This model includes a built-in brake chopper for effective dynamic braking control.
Q: What control method is utilized by the RD51.1-4B-075-L-L1-FW?
A: The RD51.1-4B-075-L-L1-FW supports U/f curve control for regulating motor speed.
Q: What type of cooling system does the RD51.1-4B-075-L-L1-FW use?
A: This drive controller is cooled using a forced air cooling system for temperature management.
Q: What is the rated power capacity of the RD51.1-4B-075-L-L1-FW drive controller?
A: The RD51.1-4B-075-L-L1-FW handles a rated power output of 75 kW.
Q: What input voltage and supply type does the RD51.1-4B-075-L-L1-FW require?
A: This model accepts a three-phase AC supply in the voltage range of 380 to 480 V.
