Product Description:

The RD52.1-4B-003-L-V1-FW is produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series, and it regulates motor speed and torque in automated production lines. By converting three-phase mains energy into precisely modulated output, the unit links programmable logic controllers to motion hardware and supplies vector-regulated current for positioning, tensioning, or conveyor duties in industrial plants. Its control functions support steady motor operation in equipment that depends on accurate speed response.

Incoming power is accepted from industrial feeders rated at 380 to 480 V, and operation remains stable within a line fluctuation of ±10 %. Because the supply stage is a 3 x AC converter, each phase is rectified and modulated independently before a synchronous waveform is delivered to the motor. The inverter bridge is dimensioned for a continuous load of 3.0 kW, matching moderate pumps, extruders, or handling axes. Torque generation is managed with field-oriented vector control; the algorithm resolves stator currents into flux-producing and torque-producing components, allowing precise response at low speed. The unit is design generation 1, and its control platform supports use in process cells that require coordinated motor control.

Thermal and braking tasks are handled by forced air cooling and an internal built-in brake chopper that channels regenerative energy to a resistor bank during deceleration. The integrated mains filter suppresses conducted emissions, removing the need for extra panel hardware. For emergency sequences, the device accepts 24 V standby power from an external source, allowing the control logic to stay active when the DC bus is off so diagnostics and fieldbus links remain available. This helps maintain status reporting during controlled shutdown events.