RD51.2-4B-003-P-A1-FW Bosch Rexroth Indramat
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MPN: R911201027
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The Bosch Rexroth Indramat RD51.2-4B-003-P-A1-FW is a drive controller from the RD 500 Drive Controllers series, offering a rated power of 3.0 kW and a voltage range of 380 to 480 V. It features U/f curve control, a built-in brake chopper, and an integrated mains filter. The product utilizes a heat dissipation panel for cooling and is designed for converter 3-phase AC supply.
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Product Description:
The RD51.2-4B-003-P-A1-FW is a drive controller manufactured by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. The unit interfaces with three-phase power networks and downstream induction motors, providing variable voltage and frequency for conveyor sections, pumps, fans, and general motion axes in automated lines. By managing motor speed through scalar modulation, it allows process equipment to start smoothly, adapt to changing loads, and reduce mechanical stress during routine cycling. This type of controller is commonly used where adjustable-speed operation is needed without the tighter feedback structure of a servo axis. Its role is to match motor output more closely to process demand instead of running at full speed at all times.
The control algorithm follows U/f curve control, so output voltage rises with frequency to help maintain motor flux across the operating range. A built-in brake chopper dissipates regenerated energy during rapid deceleration, which helps prevent DC-link overvoltage when loads slow down quickly. Line-side disturbances are reduced by the integrated mains filter, which limits high-frequency emissions to nearby equipment and supports cleaner cabinet operation. The permissible input spans 380 to 480 V, and the rated output of 3.0 kW suits medium-duty motors used on compact process machinery. That combination supports stable motor behavior during acceleration, steady running, and deceleration in general industrial service.
Incoming energy uses a three-phase AC converter supply, and the power stage can absorb fluctuations within ±10 % without derating during normal plant variation. Thermal management is handled by a heat dissipation panel, which transfers losses directly to the enclosure wall and reduces the need for internal cabinet airflow on smaller installations. The hardware belongs to Design Generation 2, and it supports externally supplied standby power together with a starting lockout function that blocks unintended restarts after a power failure. Externally supplied standby power lets the control section remain available for status retention and command handling when the main power stage is inactive.
