Product Description:

The RD51.2-4B-015-L-DF-FW belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. It is a three-phase converter that regulates the speed of AC motors in automated machinery and material-handling lines, providing programmed acceleration, deceleration, and steady-state operation under changing load demands. By varying output frequency and voltage, it lets the connected motor respond smoothly to process changes without abrupt speed shifts or unnecessary mechanical stress.

This controller delivers a nominal output of 15.0 kW, which is suited to midrange pump, fan, and conveyor duties. It accepts line power within 380 to 480 V and keeps performance consistent over a tolerance band of ±10%, allowing stable operation on utility grids that fluctuate. The incoming supply must be three-phase because the unit is a 3 x AC converter. Internally, motor flux is modulated through U/f curve control, so the user can match voltage to frequency for constant-torque or variable-torque loads. This control method supports common motor applications that require stable speed as process demands change.

Thermal management is handled by forced air cooling, so the heat sinks require unobstructed airflow from the dedicated fan. Rapid energy from decelerating loads is dissipated through the built-in brake chopper, which removes the need for an external braking module. Input cleanliness is improved by an integrated mains filter that attenuates conducted emissions toward the plant power bus. The design is classified as generation 2 within the RD 500 family. Additional field functions include a NAMUR terminal strip with 24 V standby power for external signaling and a feedback channel that reports the current of U6, V6, and W6 phases to supervisory controls. These monitoring connections support status reporting and coordination with external control circuits.