RD51.1-4B-018-L-D1-FW Bosch Rexroth Indramat
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MPN: R911200352
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The Bosch Rexroth Indramat RD51.1-4B-018-L-D1-FW is a drive controller from the RD 500 Drive Controllers series. It features a rated power of 18.5 kW and operates on a voltage range of 380 to 480 V with a tolerance of ±10%. This model uses U/f curve control, includes an integrated mains filter, and has forced air cooling with a built-in brake chopper.
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Product Description:
Bosch Rexroth Indramat's RD51.1-4B-018-L-D1-FW is a drive controller in the RD 500 Drive Controllers series. It serves as the central power stage for three-phase induction motors in automated lines, packaging equipment, and material handling cells. By matching motor voltage and frequency to process demand, it supports steady speed control and consistent torque delivery during routine industrial operation. This type of controller is suitable for applications that need smooth motor response without servo-style positioning functions.
The unit draws power from a three-phase AC supply and accepts line variation of ±10 % across a mains range of 380 to 480 V. Maintaining operation across this voltage window helps the controller tolerate normal plant supply variation without unnecessary interruption. The controller uses U/f curve control, which maintains a fixed voltage-to-frequency ratio that suits standard squirrel-cage motors and keeps operation straightforward. Because this control method does not depend on complex feedback tuning, it is well suited to general-purpose motor duties that emphasize stable running. Continuous mechanical output is supported by an inverter section rated at 18.5 kW, allowing medium-duty pumps, fans, or conveyors to accelerate smoothly under normal load. Thermal management relies on forced air cooling, so airflow through the heat sink channels must remain unobstructed during operation. During rapid stops or overhauling loads, the built-in brake chopper diverts regenerated energy to external resistors and helps prevent DC-link overvoltage.
An integrated mains filter reduces conducted emissions on the supply connection, which can simplify cabinet integration where multiple control devices share the same incoming power. The NAMUR terminal strip provides clearly marked I/O connection points for control wiring, helping signal routing stay organized inside the panel. An external 24 V standby supply keeps the control electronics energized for parameter retention when the main disconnect is open. The standby circuit keeps stored settings available while the main power section remains disconnected.
