Product Description:

The RD51.2-5B-007-L-A1-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It is a configurable AC converter intended for regulating three-phase induction motors in factory automation lines, conveyors, and process equipment. By adjusting motor voltage and frequency, the unit coordinates speed and torque to match real-time load requirements while maintaining consistent production throughput. This control approach helps the connected motor respond smoothly to changing load conditions during both continuous and intermittent operation, which is useful where process demand does not stay constant.

For dynamic deceleration, the model integrates a built-in brake chopper, eliminating the need for an external braking resistor module. Speed regulation is handled through U/f curve control, which keeps the voltage-to-frequency ratio constant so motor flux remains stable across the operating range. Thermal energy is removed by forced air cooling, and internal fans move cabinet air across the heat sink to control semiconductor temperature. The unit is part of design generation 2, which matches second-generation option cards and parameter sets. Under continuous duty, it delivers 7.5 kW of output to the motor terminals, and it draws power from a three-phase AC converter supply supported by line reactors or isolation transformers.

With a mains input window centered at 500 V, the controller is suited for factory power systems that emphasize lower current draw at a given output level. An external standby power circuit allows the control electronics to remain energized for fieldbus monitoring while the power stage is disabled. A programmable starting lock-out function prevents unintended motor rotation after faults are cleared or after the drive is re-enabled. This arrangement allows communication and status supervision to continue even when motor power is not active, which supports orderly restart behavior after a stop.