Product Description:

The RD51.1-4B-315-R-V1-FW is manufactured by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. Within an automated line, it functions as a power and control interface that adjusts motor speed and torque to match process demands in variable-speed industrial machinery. This arrangement lets the drive respond to setpoint changes from the control system with regulated power delivery at the motor terminals. The controller is installed in the electrical cabinet, links directly to PLC command signals, and converts incoming three-phase mains power into regulated output for the motor while supporting coordinated machine operation.

The unit delivers a rated output of 315 kW, allowing continuous operation of high-power machinery such as large pumps, fans, and other demanding process loads. It accepts mains in the range of 380 to 480 V and uses U/f curve control, so output voltage rises with frequency to help keep motor flux stable across the speed range and support predictable torque response. A built-in brake chopper is connected to the DC link, which allows braking energy to be dissipated internally instead of being returned to the plant supply during deceleration. Thermal loads are managed by liquid cooling with an internal pump, which circulates coolant through internal passages to help maintain stable semiconductor temperatures on higher-power frames and reduce reliance on cabinet airflow alone.

An integrated mains filter reduces conducted interference on the supply connection and supports compliance with common EMC limits in industrial installations. The control board can remain active from 24 V stand-by power, which keeps diagnostic access and status monitoring available when the main power stage is switched off. The main stage is built as a 3 x AC converter for three-phase input operation, matching standard industrial mains arrangements. Its supply range allows a ±10 % tolerance, so moderate line variation can be accommodated without leaving the stated operating window.