RD51.1-5B-037-L-NN-FW Bosch Rexroth Indramat
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MPN: R911200684
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The Bosch Rexroth Indramat RD51.1-5B-037-L-NN-FW is a drive controller from the RD 500 Drive Controllers series. It features a rated power of 37 kW and has a built-in brake chopper. This unit uses U/f curve control and forced air cooling, and is designed for use with a 500 V, 3-phase AC supply.
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Product Description:
The RD51.1-5B-037-L-NN-FW is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series for variable-speed operation of three-phase induction motors in industrial automation. Acting as the power stage between the mains and the motor, it adjusts voltage amplitude and output frequency so conveyors, pumps, and mixers can follow process setpoints issued by a PLC. The unit is intended for mounting inside a ventilated electrical cabinet near the driven load, where ambient air can circulate freely. This placement supports stable operation in installations where the controller must remain close to the motor while still receiving adequate cabinet airflow.
This controller includes a built-in brake chopper, allowing excess regenerative energy to be routed to an external resistor instead of returning to the grid. Motor speed is regulated with U/f curve control, a scalar method that maintains constant air-gap flux without requiring encoder feedback. Thermal stability is maintained by forced air cooling, and internal fans move ambient air across the heat sink to keep semiconductor junction temperatures within limits. The power section can deliver a continuous mechanical output of 37 kW, which suits medium-sized pumps, extruders, and similar driven equipment. Input networks must remain within a nominal supply of 500 V three-phase so the rectifier, DC-link capacitors, and IGBT bridge stay within their intended operating range.
The drive is supplied as a three-phase AC converter unit, so rectification and inversion are handled internally and no separate line transformer is required unless electrical isolation is needed. It is part of design generation 1, which keeps the housing dimensions and parameter numbering consistent with early RD51 hardware already used in existing systems. The unit has unequipped expansion slots, leaving space for future fieldbus, I/O, or safety cards if application needs change. These open option positions allow the controller to be adapted later without changing the base power unit.
Frequently Asked Questions about RD51.1-5B-037-L-NN-FW:
Q: Does the RD51.1-5B-037-L-NN-FW feature an integrated brake chopper?
A: The RD51.1-5B-037-L-NN-FW includes a built-in brake chopper for managing resistive braking energy.
Q: What control method does the RD51.1-5B-037-L-NN-FW use?
A: This drive controller operates using U/f curve control for motor regulation.
Q: How is the RD51.1-5B-037-L-NN-FW cooled during operation?
A: Forced air cooling is used in this model to maintain optimal operating temperatures.
Q: What is the rated power capability of the RD51.1-5B-037-L-NN-FW?
A: The rated power output of this drive controller is 37 kW.
Q: What type of power supply and voltage does the RD51.1-5B-037-L-NN-FW require?
A: The RD51.1-5B-037-L-NN-FW is designed to be supplied with 3-phase AC power at a voltage range of 500 V.
