Product Description:

The DKR04.1-W300N-BT71-02-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat as part of the DKR Drive Controllers series. Intended for high-power automation cells, it converts plant supply energy into regulated three-phase output for coordinated servo motion. Its role is to serve as the power and control stage between the supply network and compatible motor systems. The unit belongs to the fourth line of the series and uses design version 1, providing a standardized platform for material handling, machining, and packaging equipment.

The power section operates from 3xAC 400–480 V ±10%, allowing stable performance on industrial utility grids. Logic and I/O circuits are served separately by AC 230 V ±10%, so the control layer can be isolated independently when required. At a 4 kHz switching frequency, the controller supplies a continuous output of ca. 82 kW while maintaining a motor phase current of 185 A. Fast acceleration events are supported by a peak capability of 212 A, which provides short-term current reserve during dynamic load changes. Waste heat during full-load operation reaches 2250 W, so enclosure airflow and heat removal must be planned carefully to keep internal temperatures under control.

Thermal energy is removed by a built-in air blower, so no external coolant loops are required. The DC bus is supplied without a brake chopper, which means regenerative energy must be handled by the mechanical system or by external braking hardware because no internal bleeder is included. Motion commands arrive through the SERCOS interface, and the drive accepts both digital servo and resolver feedback for compatibility with different Indramat motor generations. The unit has a mass of 150 kg, so the cabinet and mounting structure must support a substantial installed load while keeping the assembly secure during operation.