RD51.1-4B-055-L-C1-FW Bosch Rexroth Indramat
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MPN: R911200467
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The Bosch Rexroth Indramat RD51.1-4B-055-L-C1-FW is a drive controller in the RD 500 Drive Controllers series with a rated power of 55 kW and operates on a voltage range from 380 to 480 V. It features forced air cooling, built-in brake chopper, and an integrated mains filter. This controller uses U/f curve control and supports 24 V stand-by power.
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Product Description:
The RD51.1-4B-055-L-C1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Installed inside a control cabinet, this Generation 1 unit converts three-phase mains power into regulated motor voltage and frequency so automated conveyors, mixers, and pump skids can run at the commanded speed without manual intervention. By modulating the output waveform, the controller forms the link between plant-level PLC commands and the mechanical work executed by an AC motor. Because the output frequency is adjustable, the connected motor can match process demand more closely than with fixed-speed operation.
The controller delivers a continuous output of 55 kW, which is the maximum continuous power available to the connected motor during steady operation. Its input accommodates a line window of 380 to 480 V. It also tolerates supply variations of ±10 %, allowing reliable operation on industrial networks that experience moderate voltage swing. The controller uses U/f curve control, so voltage rises proportionally with frequency to maintain magnetic flux during acceleration and light-load operation. Internal heat is removed by forced air cooling; axial fans move cabinet air across the heat sink and help keep semiconductor temperatures within safe limits when the converter operates near rated current.
On the supply side, the unit is configured as a converter with three-phase AC input and includes a built-in brake chopper to dissipate regenerated energy during rapid deceleration. The brake chopper handles returned energy internally instead of requiring a separate external braking assembly in the cabinet. Harmonic mitigation is addressed by an integrated mains filter, which reduces conducted emissions on the incoming line. For control electronics and fieldbus modules, a 24 V standby power function keeps logic active during main-power isolation. This helps preserve diagnostic information and supports external drives up to 110 kW that share the same support supply.
