RD51.1-5B-075-L-DL-FW Bosch Rexroth Indramat
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MPN: R911201183
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The Bosch Rexroth Indramat RD51.1-5B-075-L-DL-FW is a drive controller and part of the RD 500 Drive Controllers series. It features a rated power of 75 kW, supports converter 3 x AC supply, and operates at a voltage range of 500 V. This controller uses forced air cooling and includes a built-in brake chopper.
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Product Description:
The RD51.1-5B-075-L-DL-FW is a drive controller manufactured by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It is intended for variable-speed operation of three-phase induction motors, converting fixed mains power into a regulated output that matches changing process demands during startup, steady running, and deceleration. The unit is used in factory lines where coordinated speed, acceleration, and controlled stopping are required for stable motor-driven operation.
This controller is supplied as a Converter 3 x AC device, which means it accepts three-phase mains power and converts that energy for motor use. Its input voltage is centered on 500 V, allowing connection to typical 480 V industrial grids without an autotransformer. The power stage is rated for 75 kW, so it can operate medium-sized pumps, fans, or extruders without derating. Speed regulation uses U/f curve control, which maintains a fixed relationship between stator voltage and frequency to help keep air-gap flux stable during acceleration and low-speed operation. A built-in brake chopper is integrated into the DC link so regenerated energy can be directed to an external resistor, shortening motor deceleration time and helping protect the intermediate circuit from overvoltage.
Thermal management relies on forced air cooling, with internal fans drawing cabinet air across the heat sinks so the unit can deliver full current in typical control-room ambient conditions. The unit is generation 1, indicating the first production revision. For field wiring, the controller includes a NAMUR terminal strip with external 24 V stand-by power, which supports intrinsically safe sensor loops even when the main converter is de-energized. An optional cable damping feedback (C3, D3) function reports line impedance to the control board and improves diagnostic accuracy over long motor leads.
Frequently Asked Questions about RD51.1-5B-075-L-DL-FW:
Q: Does the RD51.1-5B-075-L-DL-FW include a brake chopper?
A: The RD51.1-5B-075-L-DL-FW features a built-in brake chopper for controlled deceleration during motor operation.
Q: What type of control does the RD51.1-5B-075-L-DL-FW use?
A: This drive controller provides U/f curve control for managing motor speed and torque.
Q: How is the RD51.1-5B-075-L-DL-FW cooled?
A: The RD51.1-5B-075-L-DL-FW operates with forced air cooling to maintain optimal temperature during use.
Q: What is the rated power of the RD51.1-5B-075-L-DL-FW drive controller?
A: This model has a rated power output of 75 kW, supporting demanding drive applications.
Q: What voltage range does the RD51.1-5B-075-L-DL-FW support?
A: The voltage range for this drive controller is 500 V, compatible with 3-phase AC input supply.
