Product Description:

The RD51.1-5B-090-L-V1-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. Designed for cabinet installation, the unit converts fixed mains power into a variable output that regulates standard AC motors, allowing production machinery to start smoothly, change speed on demand, and stop under controlled conditions. It fits on a standardized mounting rail and interfaces with fieldbus modules for command exchange. This arrangement supports use in equipment that needs adjustable motor operation without relying on mechanical speed control methods.

It is fed by a three-phase AC converter front end that accepts utility input from a three-phase supply. Inside the controller, power is processed for loads operating in the 500 V class, matching common plant distribution voltages. The inverter section is sized for a continuous mechanical output of 90 kW, which suits medium-to-large pumps, fans, and extruders. Speed and torque are managed with U/f curve control, a scalar method that links output frequency to voltage so motor flux remains stable across the operating range. Thermal energy from switching devices is removed by forced air cooling, and airflow through the heat sink helps maintain acceptable semiconductor temperatures during sustained operation.

The controller includes a built-in brake chopper that dissipates regenerated energy during rapid deceleration, helping prevent DC-link overvoltage. The unit is part of design generation 1. Control electronics can remain active during mains interruptions when an external 24 V stand-by power supply is connected, which helps preserve fieldbus communication and diagnostic memory. Application-specific functions are selected through a separate firmware order, so the drive can be matched to the intended machine behavior without changing the base hardware.