Product Description:

The RS51.1-4G-031-D-V1-FW/S150 drive controller is built by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Classified by the manufacturer as a basic drive, the unit forms the central power stage that converts fixed-frequency mains into a regulated output for asynchronous motors in automated machinery, conveyors, and process equipment. By supplying controlled voltage and frequency, it allows speed and torque adjustment directly from the cabinet without mechanical gear changes.

Its apparent output capability reaches 31 kVA, meaning the converter can deliver this level of three-phase apparent power to connected loads. The input can be any industrial line within 380 to 480 V, and operation remains stable within a tolerance of ±10 %. Power enters the unit through a Converter 3 x AC front end that rectifies and inverts the supply for motor use. Thermal energy is removed by a plug-through cooler rated for installations up to 110 kW, permitting mounting through the cabinet wall so that heat is expelled outside the enclosure. Deceleration energy is absorbed by the internal built-in brake chopper and resistor, eliminating the need for an external braking module. Speed regulation follows a U/f curve control strategy, delivering proportional voltage as frequency varies to keep the motor magnetized under changing loads.

Additional functions include 24 V stand-by power that keeps control electronics active when the main bus is de-energized, and an integrated mains filter that mitigates line-side harmonics without extra components. This controller belongs to design generation 1, so its mechanical layout and parameter structure match other first-generation RD 500 modules. Firmware is ordered separately and loaded into the drive as a dedicated subposition, allowing updates without hardware changes. Because the product is labeled as a basic drive, application engineers can couple it with external option cards for fieldbus communication while relying on the internal regulator and protection circuits already resident in the base hardware.