RD51.1-4B-030-L-D1-FW Bosch Rexroth Indramat
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MPN: R911200881
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The Bosch Rexroth Indramat RD51.1-4B-030-L-D1-FW is a drive controller from the RD 500 Drive Controllers series. It features U/f curve control, a built-in brake chopper, and an integrated mains filter. The controller provides a rated power of 30 kW and operates on a 3-phase AC supply with a voltage range of 380 to 480 V.
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Product Description:
The RD51.1-4B-030-L-D1-FW is a drive controller manufactured by Bosch Rexroth Indramat and supplied as part of the RD 500 Drive Controllers series. It converts fixed mains power into a regulated output for asynchronous motors used in industrial automation. By adjusting voltage and frequency, the device supports precise speed, torque, and energy management in continuous-duty production lines, material-handling systems, and pump arrays. This type of control is commonly used where conveyors, pumps, and similar equipment need adjustable motor speed from a standard plant power source.
Rated at 30 kW, the controller can energize medium-power machines without external boosters. It accepts an input span of 380 to 480 V three-phase AC and tolerates line variation of ±10 %, allowing operation on weak or lightly stabilized grids. Motor regulation follows U/f curve control; the internal processor keeps the ratio between stator voltage and frequency constant, which helps prevent magnetic saturation at low speed. This control method is well suited to applications that need stable speed adjustment across normal operating ranges. A built-in brake chopper dissipates regenerated energy during rapid deceleration, protecting the DC link from overvoltage.
Thermal management relies on forced air cooling; a rear-mounted fan directs airflow across power semiconductors to keep the heat sink within limits during continuous duty. The power stage is configured as a Converter 3 x AC unit, which rectifies the three-phase supply and reconstructs an adjustable AC output through pulse-width modulation. Input disturbances are attenuated by an integrated mains filter, which reduces conducted emissions and helps the installation satisfy electromagnetic compatibility guidelines. Control wiring is organized on a NAMUR terminal strip, and an external 24 V standby supply maintains bus communication and diagnostics when the main supply is off. Keeping communication active during a shutdown allows status information to remain available to higher-level control equipment.
