Product Description:

The RD52.1-4N-022-L-NN-FW is a controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. Designed for cabinet installation, it interfaces between a three-phase supply and an AC motor to deliver regulated voltage and frequency. By executing real-time current vector calculations, it supports coordinated motion in pumps, conveyors, and machining axes used in automated lines. This arrangement allows the drive to respond quickly to changing load conditions while keeping motor operation stable during normal process cycles. It can also serve applications that require repeatable speed control and smooth torque delivery during routine machine operation.

Its rated output is 22 kW, which suits medium-power machinery that requires continuous torque delivery. The controller operates on mains lines from 380 to 480 V, and it tolerates input deviation up to ±10 %, so moderate supply variation does not interrupt operation. Thermal management relies on forced air cooling, with internal fans moving air through heat-sink channels to control semiconductor temperature. Precise motor regulation is achieved through field-oriented vector control, which separates stator current into torque-producing and magnetizing components for fast response during acceleration, deceleration, and load changes. This control method also helps the motor maintain steady behavior at varying speeds without abrupt corrections from the drive.

Power quality is improved by an integrated mains filter that attenuates conducted interference, reducing the need for external EMC hardware in most cabinets. The unit is supplied without a built-in brake chopper, so rapid braking that produces excess energy requires a separate external module. The front end is configured for connection to a three-phase AC converter supply, which supports regenerative power flow back to the mains when braking energy is routed through the converter. This layout is suited to cabinet systems that already use a shared conversion stage for line interaction and energy handling. The unit is part of design generation 1, and no additional functions are installed in this version.