RD51.1-5N-055-D-DL-FW Bosch Rexroth Indramat
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MPN: R911201301
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The Bosch Rexroth Indramat RD51.1-5N-055-D-DL-FW is a drive controller from the RD 500 Drive Controllers series. It offers a rated power of 55 kW, operates with a voltage range of 500 V, and uses a converter supply of 3 x AC. The unit features U/f curve control, a plug-through cooler, and comes without a built-in brake chopper.
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Product Description:
The RD51.1-5N-055-D-DL-FW drive controller is produced by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. It is intended for variable-speed control of three-phase induction motors in automated machinery and material-handling cells. By modulating output voltage and frequency, the unit allows a single motor to follow precise speed commands. That operating approach suits conveyors, agitators, pump sets, and similar equipment that need adjustable speed without mechanical gear changes or throttle losses. Because it is intended for induction-motor duty rather than axis positioning, it fits process equipment where stable speed regulation is more important than synchronized servo motion.
This model uses a three-phase AC converter input and is designed for grids that deliver up to 500 V. Its inverter section can supply a continuous mechanical output of 55 kW, matching midsize production motors in fans, compressors, and extruders. Regulation is handled with U/f curve control, which keeps the ratio between stator voltage and frequency constant so motor flux remains stable across the speed range. For thermal management, the controller incorporates a plug-through cooler (≤ 110 kW) so its heat sink passes through the cabinet wall and releases losses directly to ambient air. This layout helps reduce enclosure heating and leaves more cabinet space for other control components.
It is a design generation 1 product. The power stage comes without a built-in brake chopper, so regenerative energy created during rapid deceleration must be handled by an external braking module. Low-level signaling uses a NAMUR terminal strip with an independent 24 V standby supply that keeps field contacts active during line-power interruptions. Long motor cables are supported by cable-damping feedback (C3, D3), which adjusts pulse patterns to reduce the effects of voltage drop along the leads. This arrangement helps maintain more consistent motor voltage when the installation requires extended cable runs.
Frequently Asked Questions about RD51.1-5N-055-D-DL-FW:
Q: What series does the RD51.1-5N-055-D-DL-FW drive controller belong to?
A: This model is part of the RD 500 Drive Controllers series.
Q: What is the rated power for the RD51.1-5N-055-D-DL-FW drive controller?
A: The RD51.1-5N-055-D-DL-FW has a rated power output of 55 kW.
Q: What type of control method is used in the RD51.1-5N-055-D-DL-FW drive controller?
A: This drive controller utilizes U/f curve control for motor operation.
Q: What cooling method does the RD51.1-5N-055-D-DL-FW use?
A: Cooling is provided by a plug-through cooler for units up to 110 kW.
Q: What is the supply type and voltage range for the RD51.1-5N-055-D-DL-FW?
A: This model operates with a 3-phase AC converter supply and supports a voltage range of 500 V.
