RD51.1-5B-018-L-NN-FW Bosch Rexroth Indramat
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MPN: R911200362
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The Bosch Rexroth Indramat RD51.1-5B-018-L-NN-FW is a drive controller in the RD 500 Drive Controllers series. It has a rated power of 18.5 kW, operates with a 500 V voltage range, and uses a converter for 3-phase AC supply. This model features a built-in brake chopper and U/f curve control, and is cooled by forced air.
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Product Description:
The RD51.1-5B-018-L-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It is intended for scalar control of three-phase induction motors in automated equipment, where the unit converts fixed-frequency mains power into a variable-frequency output that follows a programmed voltage-to-frequency profile. Within an industrial panel, it regulates motor speed, supports soft acceleration, and manages regenerative energy during deceleration without relying on mechanical contactors. This makes the controller suitable for conveyors, fans, pumps, and other machinery that benefits from steady speed control and predictable motor response. Because the control method is scalar rather than vector-based, the unit is aimed at applications that prioritize reliable speed adjustment over high-dynamic servo performance.
The controller supplies up to 18.5 kW of motor power when connected to a three-phase network within a 500 V bus window. Power enters through a three-phase AC converter section that rectifies and smooths the incoming line before the inverter modulates the output for the motor. Thermal management uses forced air cooling, with a dedicated fan moving cabinet air across the heat sink to maintain stable semiconductor temperatures during continuous operation. Speed commands are processed through U/f curve control, a scalar method that keeps motor magnetizing flux consistent by raising output voltage in proportion to frequency. The general-purpose I/O bay is supplied without extra fieldbus or safety options, leaving the basic control structure focused on standard drive functions.
Overvoltage energy is dissipated by a built-in brake chopper, which helps control the DC link when a decelerating load returns power to the drive. This arrangement reduces the need for separate braking hardware in many standard stopping cycles. The unit is part of Design Generation 1, so its wiring arrangement and menu structure follow the earliest layout used in this product line. It uses the standard mechanical footprint and connector layout for the platform, which helps it fit cabinets prepared for this drive family. Open function slots allow optional interfaces to be added when the application requires more communication or control features.
Frequently Asked Questions about RD51.1-5B-018-L-NN-FW:
Q: What is the rated power output of the RD51.1-5B-018-L-NN-FW controller?
A: The RD51.1-5B-018-L-NN-FW drive controller offers a rated power output of 18.5 kW.
Q: What cooling method does the RD51.1-5B-018-L-NN-FW employ?
A: This model utilizes forced air cooling to maintain optimal operating temperatures.
Q: Does the RD51.1-5B-018-L-NN-FW come with a brake chopper?
A: The RD51.1-5B-018-L-NN-FW is equipped with a built-in brake chopper for energy dissipation during braking.
Q: What control type is provided by the RD51.1-5B-018-L-NN-FW?
A: Operation of this drive controller is based on U/f curve control.
Q: What type of supply and voltage rating does the RD51.1-5B-018-L-NN-FW support?
A: This drive controller is designed for 3-phase AC power supply with a voltage rating of 500 V.
