Product Description:

The RD51.1-4B-022-L-CF-FW is a drive controller manufactured by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. It is intended for speed and torque regulation of three-phase induction motors used in automated machinery, conveyors, and process equipment. By converting fixed mains power into variable-frequency, variable-voltage output, the unit lets production lines match motor speed to load demand and reduce electrical stress on mechanical components. This operating method also helps motors start more smoothly and run at speeds that better fit the process instead of remaining tied to line frequency.

This model operates from a three-phase input within 380 to 480 V and has a rated mechanical output of 22 kW. This power range suits many medium-duty industrial motor applications where adjustable speed is needed for steady process control. The front-end topology is a 3 x AC converter, allowing direct connection to industrial power networks, and acceptable mains variation is limited to ±10 % for stable operation where supply voltage fluctuates moderately. An integrated mains filter attenuates conducted emissions so additional line reactors are usually unnecessary, and the drive belongs to design generation 1.

A built-in brake chopper dissipates regenerative energy during rapid deceleration, protecting the DC link without external hardware. Motor flux is managed through U/f curve control, which is suitable for standard pumps and fans where closed-loop vector control is not required, and thermal management relies on forced air cooling as axial fans draw cabinet air across the heat sink to maintain semiconductor junction temperatures. This cooling method supports continuous operation in enclosed control cabinets when normal airflow paths are maintained. The functional option set is combination C1 + F1, which provides a predefined group of I/O and communication capabilities for typical factory automation tasks.