Product Description:

The RD51.1-4B-110-L-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It interfaces between plant power and AC motors, converting fixed-frequency input into adjustable output pulses that control conveyor lines, pumps, and other general-purpose machinery. Supplied as a standalone cabinet module, it can mount beside motor control centers or inside machine frames to shorten cable runs and keep installation layouts compact. This arrangement lets the drive vary motor speed to match process demand, which supports steady operation during normal starts, stops, and load changes.

The controller accepts a three-phase input of 380 to 480 V and is configured as a 3 x AC converter, so it rectifies and inverts mains power for motor operation. With a continuous rating of 110 kW, it can supply large induction motors used in production and utility systems. Regulation is based on U/f curve control, where output voltage rises with frequency to maintain usable magnetic flux across the speed range. The permissible mains fluctuation window of ±10 % helps the unit remain stable when facility power varies within normal industrial limits. This operating method suits applications that need reliable speed adjustment and smooth running rather than highly dynamic positioning behavior.

A built-in brake chopper dissipates regenerated energy during rapid deceleration, which helps protect the DC bus when driven loads slow down quickly. Thermal stability relies on forced air cooling, and the internal airflow path removes heat from power semiconductors so the controller can support sustained operation under load. Line-side interference is reduced by an integrated mains filter, which lowers conducted emissions and supports cleaner interaction with the incoming supply. The unit is part of design generation 1, which identifies this product generation within the RD 500 range.