Product Description:

The RD51.1-7N-015-L-NN-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It converts DC-bus supply power into adjustable voltage and frequency for induction motors used in conveyors, mixers, pumps, and other industrial motion equipment. Because it works as an inverter stage instead of a complete mains-input drive, it fits modular systems that separate rectification from motor control. That arrangement allows several drive sections to operate from a shared bus while each motor still receives speed control suited to its process.

The RD51.1 uses U/f curve control, so output frequency follows a preset voltage-to-frequency relationship that helps standard induction motors maintain usable torque across a broad speed range. It accepts a DC bus window of 530 to 670 V, which matches common rectifier sections on 400 VAC class mains. Within that range, it can deliver up to 15.0 kW of motor power, making it suitable for medium-duty fan, pump, and conveyor service. The power stage is designed for an Inverter DC link rather than direct AC mains input. Thermal management uses forced air cooling, and an internal fan moves air through the heat sink to control semiconductor temperature during continuous operation.

This controller is part of Generation 1 of the product line, so it follows the first-generation platform used in the RD family. It is supplied without a built-in brake chopper, which means braking energy from overhauling or fast-decelerating loads must be handled by external hardware when required. The control board uses firmware ordered as a separate subposition rather than preloaded software. Its option slots are not equipped, leaving room for later addition of application-specific I/O or communication cards. That layout is useful when a base inverter is selected first and interface functions are added only when the application requires them.