Product Description:

The RD51.1-4N-005-P-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It regulates the speed of three-phase induction motors in automated machinery, allowing production lines, pumps, and fans to match motor torque to process demand while staying coordinated with higher-level plant controls. That operating role lets the drive respond to changing load conditions without requiring the motor to run at a fixed line frequency. The controller is intended for cabinet installation, uses protective earth as its reference, and places the motor, control, and power terminals on the front for direct wiring access.

This unit is powered from a three-phase AC converter supply and accepts line voltages from 380 to 480 V. It tolerates deviations of ±10% without losing regulation, which helps it remain stable on common industrial power systems. The inverter section can deliver a continuous mechanical output of 5.5 kW, making it suitable for medium-duty motion tasks. Speed regulation is carried out through U/f curve control, which maintains motor flux across the operating range. This control method is well suited to applications that need reliable speed adjustment with straightforward motor operation. An integrated mains filter reduces incoming harmonics, so extra line chokes are usually unnecessary.

Thermal management is provided by a heat dissipation panel sized for devices up to 18.5 kW, so forced-air or liquid cooling is not required when the panel is mounted to a metal backplate with free airflow. The mounting surface becomes part of the cooling path, so open airflow around the panel helps remove heat from the enclosure. The drive operates without a built-in brake chopper, so braking energy must be sent to an external resistor when the application requires rapid deceleration. The unit is in generation 1 and is supplied without optional function modules, leaving the control layout in its basic form.