Product Description:

The RD51.1-5B-011-D-CF-FW belongs to the RD 500 Drive Controllers series from Bosch Rexroth Indramat. As a drive controller, it sits between a three-phase supply and an AC machine to regulate speed and torque in conveyors, pump groups, and other automated equipment. That role allows the unit to adjust electrical output as load conditions change during starting, steady running, and controlled stopping. It is part of Design Generation 1, which places it within the first RD 500 platform and allows use with matching option-card and fieldbus expansions for that generation.

For basic motor operation, the controller uses U/f curve control, keeping the voltage-to-frequency ratio constant so induction motors run with stable magnetizing current over the commanded speed range. Thermal management relies on a plug-through cooler for units up to 110 kW, so power loss is carried outside the enclosure while the control section remains in cooler cabinet air. The unit accepts a three-phase AC input, and the DC link is rated for a nominal line voltage of 500 V. During deceleration or overhauling loads, a built-in brake chopper diverts excess energy to an external resistor to prevent DC-bus overvoltage.

The application layer can be extended with Combination: C1 + F1, which enables predefined control macros and additional fieldbus telegrams for specialized machine behavior. The added function set is useful when the base controller must exchange more application data or switch among preset operating behaviors without changing the main power section. The product is classified as a Drive Controller, so the power and control connections are arranged for line, motor, and brake-resistor wiring. This layout suits installations where the controller must coordinate motor operation while remaining separate from the machine's external resistor and higher-level control hardware.