Product Description:

The DKR04.1-W300N-BE76-01-FW drive controller is produced by Bosch Rexroth Indramat as part of the DKR Drive Controllers series. It functions as a digital intelligent AC drive controller that regulates high-power servo axes in automated machinery by converting line energy into precisely timed three-phase output for motors. In automation systems, it serves as the power and control stage for large motion axes that require stable current regulation and accurate speed response. The unit is part of line series 04 with design version 1 and function module version 01, which places it within a specific platform revision.

The drive connects to a three-phase supply of 3xAC 400 ... 480 V ±10% and delivers a continuous output current of 185 A at a 4 kHz switching frequency, corresponding to about 82 kW of sustained mechanical power. When rapid acceleration is required, the current can rise briefly to 212 A to support changing load demand without immediately limiting output. Heat generated by the power electronics leaves the housing as 2250 W of waste energy, so cabinet airflow must be planned carefully to move that heat away from surrounding components. The internal current rating code of 300 matches the power section to heavy industrial motors, while the rigid DC bus omits a brake chopper and external bleeder so regenerated energy can return to the supply.

Command and diagnostic data move over the SERCOS interface, and the controller processes digital servo or resolver feedback for closed-loop positioning. Logic circuits are supplied by AC 230 V ±10% independently of the main power feeds, which helps keep control functions active during brief mains dips and allows the control section to remain separate from the power stage supply. Cooling air is circulated by a built-in air blower, providing forced-air cooling for the internal heat sink surfaces. Installed mass reaches 150 kg, so the unit needs a rigid mounting surface and suitable lifting support during installation.