Product Description:

The DKR04.1-W400N-BE45-01-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat and placed in the DKR Drive Controllers series. It governs high-power servo axes in automated machinery by converting three-phase mains energy into regulated armature current. The unit uses a rigid DC bus and operates without a brake chopper, so external dynamic braking components must absorb regenerated energy. At roughly 150 kg, the controller is installed in cabinets where mass and footprint are acceptable in exchange for high continuous power density. This layout is intended for larger control enclosures rather than decentralized machine mounting.

During steady operation at a 4 kHz switching frequency, the drive delivers a continuous output current of 210 A, corresponding to about 93 kW when paired with a suitable motor. The power stage is fed from a three-phase mains window of 400–480 V AC ±10 %, and the 400 A rating code marks the maximum RMS line current. For brief acceleration peaks, it supplies 282 A without a thermal trip. Conversion and switching losses produce 2500 W of heat that must be exhausted by cabinet airflow. Design version 1, line series 04, and function module 01 identify this controller within the product range.

Control and diagnostics travel through a SERCOS interface, while command processing is powered by an auxiliary supply that accepts AC 230 V with ±10 % variation for logic and blower circuits. The integrated thermal management relies on air cooling with a built-in blower, which eliminates water lines inside the cabinet and helps keep semiconductor junction temperatures within range under load. Motor position and velocity loops close via digital servo and resolver feedback, enabling the drive to tune synchronous or asynchronous servomotors over the rigid DC bus without additional interface cards.