Product Description:

The RD51.1-4N-022-L-CF-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It regulates three-phase induction motors in factory automation by converting fixed mains frequency into the variable output needed for process speed control. The unit is intended for cabinet installation, where it can support controlled motor operation in conveyor systems, pumps, fans, and other industrial equipment. It is identified as design generation 1, so its operating behavior follows the first release of the platform.

This controller delivers a rated mechanical shaft power of 22 kW. It accepts a line supply in the 380 to 480 V range, and the input can vary by up to ±10 % without derating, which helps the drive remain stable on industrial networks with normal voltage variation. Thermal management relies on forced air cooling, with fans moving air across the heat sinks to keep semiconductor temperatures within their operating limits. The controller uses U/f curve control, which maintains a proportional relationship between stator voltage and frequency to help keep motor flux stable across the speed range. This control method is commonly used for dependable speed regulation in general-purpose motor applications.

An integrated mains filter suppresses conducted emissions, which can reduce the need for additional external filtering in many cabinet layouts. The supply topology is listed as Converter 3 × AC, indicating that the unit rectifies a three-phase input and then inverts it to an adjustable AC output for the motor. Because the controller comes without a built-in brake chopper, braking energy must be returned to the mains or handled through an external resistor module when fast deceleration is required. The controller uses the C1 + F1 combination for its available control and communication functions. This arrangement supports the feature set used for motor regulation, diagnostics, and system integration.