Product Description:

The RD51.1-5B-110-L-NN-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. As a variable-speed converter, it manages three-phase induction motors so that conveyors, pumps, and similar loads can be started, stopped, and regulated according to process demands. The unit sits between the facility’s power supply and the motor, shaping voltage and frequency to achieve the torque and speed profiles required in automated production lines. Because it adjusts motor output to match changing load conditions, it supports smoother process control than direct line operation.

This model is rated for 110 kW, indicating the maximum continuous mechanical power it can deliver to a connected motor at nominal conditions. It is fed through a three-phase AC converter input, meaning the rectifier and inverter stages are integrated for standard three-phase networks. The internal power section is sized for applications that operate on a 500 V DC link, matching common industrial bus voltages. Speed is regulated with U/f curve control, which keeps the motor’s magnetic flux stable by maintaining a fixed relationship between voltage and frequency across the operating range. A built-in brake chopper dissipates regenerated energy during rapid deceleration and helps protect the DC bus from overvoltage while supporting shorter stopping times.

Thermal management relies on forced air cooling, so airflow through the heat sink channels must remain unobstructed during operation near the upper load limit. The unit belongs to Design Generation 1, which supports compatibility with first-generation option cards and accessories. The standard hardware layer is not equipped with expansion hardware, leaving the digital and analog slots available for fieldbus or I/O modules. This arrangement allows the controller to be adapted for applications that require added communication or local signal interfacing.