Product Description:

The DKR04.1-W400N-BE37-01-FW is a digital intelligent AC drive controller built by Bosch Rexroth Indramat for the DKR Drive Controllers series. Within an automation cell, it coordinates torque, speed, and position control for large synchronous or induction motors by exchanging commands with higher-level controls. By combining power conversion with motion regulation, the unit serves as the interface between the machine control system and the connected motor. It is intended for cabinet installation in high-power machining centers, gantries, and forming presses, where high current capacity and closed-loop control are required.

Signal exchange occurs through the SERCOS interface, linking the controller and the motion CPU for cyclic command transfer. At a switching frequency of 4 kHz, the drive can deliver a continuous current of 210 A, which supports a mechanical output of approximately 93 kW. The control electronics operate on AC 230 V ± 10%, while the power section is energized by 3 x AC 400 to 480 V ± 10%. During brief peaks, the output current may reach 282 A. The unit is design version 1, line series 04, and function module version 01. Motor position is closed-loop through digital servo and resolver feedback, allowing the controller to process commutation and motion signals within the same platform. Because the drive is supplied without a bleeder or brake chopper, regenerated energy must be handled externally through the system design.

Cooling is provided by a built-in air blower, and this airflow removes switching losses of 2500 W under nominal load. The controller has a mass of approximately 150 kg, so the cabinet structure must support a heavy installed component. This forced-air cooling method removes heat without requiring a liquid cooling circuit. Space in the enclosure must also allow for unobstructed airflow so the internal blower can move air across the heat-generating components.