Product Description:

The DKR04.1-W400N-BA09-01-FW is a drive controller produced by Bosch Rexroth Indramat for the DKR Drive Controllers series. As a digital intelligent AC drive controller, it manages high-capacity servo axes in manufacturing cells and transfer lines, converting three-phase mains power into regulated motor power while accepting resolver or digital servo feedback. By coordinating current, velocity, and position loops, the unit supplies the commanded torque required by gantries, presses, and machining centers in industrial automation. This arrangement lets the drive maintain stable motion on heavy axes that require fast response during acceleration, holding, and deceleration.

The power stage accepts a three-phase supply of 3xAC 400–480 V ±10%, and the separate control circuit must be fed with AC 230 V ±10%. At a 4 kHz switching frequency, the controller can deliver a continuous armature current of 210 A, corresponding to about 93 kW of output with suitable motors, while short transients may reach a peak of 282 A. The separate control supply supports command and logic functions independently of the main power stage, which helps keep control behavior stable during load changes. An internal rating code of 400 identifies the current class, and the analog interface allows setpoint commands to be sent directly from external PLCs. Motor position is returned through digital servo and resolver feedback channels for flexible encoder compatibility.

Cooling is provided by a built-in air blower, which removes up to 2500 W of loss heat from the power electronics. Forced airflow through the controller helps it handle sustained electrical load without requiring liquid cooling. The controller has no bleeder resistor and no brake chopper, so excess regenerative energy must be absorbed mechanically or by upstream line components. Applications with frequent deceleration must account for returned energy at the system level. The device mass is roughly 150 kg, so enclosure planning must allow for crane handling during installation. The unit is design version 1, part of line 04, and has function module version 01. The rigid DC bus selection simplifies energy flow calculations when sizing upstream protection.