RD51.1-4B-018-L-NN-FW Bosch Rexroth Indramat
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MPN: R911200181
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The Bosch Rexroth Indramat RD51.1-4B-018-L-NN-FW is a drive controller in the RD 500 Drive Controllers series. It features U/f curve control, a built-in brake chopper, and operates with a rated power of 18.5 kW. The controller uses forced air cooling, supports a voltage range from 380 to 480 V with a ±10% tolerance, and includes an integrated mains filter.
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Product Description:
The RD51.1-4B-018-L-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It manages three-phase induction motors in automated cells by adjusting output frequency and voltage so incoming line power matches the needs of the load. In conveyors, mixers, and pump skids, the unit supports controlled acceleration, deceleration, and steady speed operation, which helps reduce mechanical shock and keep process flow consistent. Because the drive varies motor speed rather than switching motors directly on line, it can reduce current spikes and smooth out starts on equipment with changing load profiles.
This controller uses U/f curve control, so motor voltage is reduced in proportion to frequency to maintain magnetic flux at lower speeds. The input section accepts 380 to 480 V, and the power stage uses a Converter 3 x AC arrangement to process three-phase supply power for variable-speed motor operation. Supply variation of ±10 % is permitted, which helps the controller remain stable on industrial networks with moderate line drift. A built-in brake chopper directs regenerated energy to a resistor during deceleration, reducing the risk of DC-link overvoltage during rapid stops. This control method is commonly used where dependable speed regulation is needed without the added complexity of vector control.
The controller is rated for 18.5 kW of continuous power and uses forced air cooling to remove switching heat during full-load operation. Air passages around the heat sink should remain clear so internal temperature can stay within the intended operating range when the unit is mounted in a cabinet. An integrated mains filter helps limit conducted interference on the incoming supply and reduces the need for separate line-side filtering hardware. The controller is part of generation 1 of the RD platform, placing it within the first release of this product line. This arrangement supports panel installations where heat removal and line-noise suppression both need attention.
Frequently Asked Questions about RD51.1-4B-018-L-NN-FW:
Q: Does the RD51.1-4B-018-L-NN-FW include a brake chopper?
A: The RD51.1-4B-018-L-NN-FW has a built-in brake chopper for dynamic braking applications.
Q: What is the supported voltage range for the RD51.1-4B-018-L-NN-FW?
A: This model supports a voltage range from 380 to 480 V, suitable for industrial power systems.
Q: What cooling method does the RD51.1-4B-018-L-NN-FW utilize?
A: The RD51.1-4B-018-L-NN-FW uses forced air cooling to manage heat during operation.
Q: What is the rated power of the RD51.1-4B-018-L-NN-FW drive controller?
A: The rated power output for this drive controller is 18.5 kW.
Q: What type of control method does the RD51.1-4B-018-L-NN-FW use?
A: This drive controller employs U/f curve control for motor management.
