RD51.1-4B-037-D-NN-FW Bosch Rexroth Indramat
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MPN: R911203564
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The Bosch Rexroth Indramat RD51.1-4B-037-D-NN-FW is a drive controller from the RD 500 Drive Controllers series with a rated power of 37 kW. It features a built-in brake chopper, an integrated mains filter, and supports a voltage range from 380 to 480 V for converter 3-phase AC supply. The controller uses U/f curve control and a plug-through cooler for models up to 110 kW.
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Product Description:
The RD51.1-4B-037-D-NN-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It modulates the frequency and voltage supplied to three-phase induction motors, allowing speed regulation and energy matching in conveyor, pump, and fan applications. This lets the connected motor run at a speed that better matches process demand instead of operating only at full line frequency. The unit is intended for cabinet-mounted variable-speed drive assemblies used in industrial automation. It is suited to installations that need adjustable motor speed from a single controller.
It is powered from a three-phase AC supply and accepts line voltages in the 380 to 480 V range, giving it flexibility on typical industrial power systems. Internally, it uses U/f curve control, so output voltage changes in proportion to frequency, which suits standard squirrel-cage motors when closed-loop feedback is not required. This control method is commonly used in general-purpose motor applications where stable speed control is needed without servo-level positioning. At its continuous rating, the controller can deliver 37 kW to the connected machine. An integrated mains filter reduces surge energy and harmonic interference entering the cabinet, so no additional external filter section is required.
The controller uses a plug-through cooler for installations up to 110 kW, and this heat sink passes through the cabinet wall so semiconductor losses are transferred to outside airflow. By moving heat to the exterior, the arrangement reduces the thermal load inside the enclosure. Deceleration energy is handled by the built-in brake chopper, which removes the need for an external resistor switch and manages regenerated energy during braking. The drive accommodates line variation within a ±10% tolerance to help maintain stable regulation during brief supply changes. The unit is part of design generation 1, and the application software is ordered as a separate subposition so the drive can be matched to the required machine functions. This base model does not include optional auxiliary functions.
Frequently Asked Questions about RD51.1-4B-037-D-NN-FW:
Q: Does the RD51.1-4B-037-D-NN-FW include a brake chopper?
A: The RD51.1-4B-037-D-NN-FW drive controller features a built-in brake chopper for energy dissipation during braking cycles.
Q: What is the rated power output of the RD51.1-4B-037-D-NN-FW drive controller?
A: This unit is rated for 37 kW of power output to support demanding industrial applications.
Q: What supply voltage range does the RD51.1-4B-037-D-NN-FW require?
A: The RD51.1-4B-037-D-NN-FW operates on a three-phase AC supply with a voltage range from 380 to 480 V.
Q: Does the RD51.1-4B-037-D-NN-FW have a mains filter included?
A: An integrated mains filter is included to help reduce electrical noise and interference.
Q: What cooling method is used by the RD51.1-4B-037-D-NN-FW controller?
A: This model utilizes plug-through cooler technology, suitable for power ratings up to and including 110 kW, to manage thermal loads.
