Product Description:

The RD51.1-4B-018-L-V1-FW belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. It is a three-phase AC converter designed to regulate induction motors in automated machinery. By varying output frequency and voltage, the controller matches motor speed to process demand, improving energy usage and process stability in conveying, pumping, and material-handling cells.

This model delivers a rated output of 18.5 kW, indicating the maximum continuous mechanical power that the connected motor can draw at nominal conditions. It accepts a line input of 380 to 480 V, so it can be wired to common industrial low-voltage systems. Regulation is based on U/f curve control, which keeps the stator flux nearly constant by adjusting voltage in proportion to frequency. This method suits standard induction motors that do not need sensor-based vector control. A built-in brake chopper dissipates regenerated energy during rapid deceleration, protecting the DC link and upstream supply. Power is supplied through a converter with 3 x AC input, meaning the unit rectifies a three-phase line into a controlled DC bus before inversion. Input fluctuations of up to ±10% from nominal line voltage are tolerated without derating, keeping the drive stable in facilities with moderate voltage swings.

Thermal management is handled by forced-air cooling; internal fans pull air through the heat sink to maintain semiconductor junction temperatures during full-load operation. To reduce conducted emissions, an integrated line filter attenuates high-frequency switching noise, eliminating the need for an external RFI line filter in most cabinets. For control electronics and fieldbus adapters, the unit relies on 24 V standby power from an external source, allowing parameter retention and communication even when the main power section is de-energized. The unit uses design generation 1 hardware.