Product Description:

The DKR04.1-W300E-BE12-01-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat and supplied within the DKR Drive Controllers series. Serving as the central power stage in multi-axis machining centers and automated assembly lines, the unit converts three-phase mains into regulated DC, manages regenerated energy, and issues synchronized torque commands to servo or spindle motors. Its role is to provide precise velocity and position control while coordinating braking energy inside the automation cabinet. The DC bus section supports coordinated motion where multiple axes must accelerate, decelerate, and hold speed with repeatable timing.

Communication with higher-level PLCs is handled through the SERCOS interface. The controller is part of line 04 and is delivered as design version 1 with function module version 01. At a 4 kHz switching frequency, it sustains 185 A of continuous output current and can supply 82 kW of continuous shaft power. The control electronics draw from an auxiliary supply of AC 230 V ±10 %, while the power stage is fed by 3×AC 400–480 V ±10 % mains. Thermal management uses air cooling with a built-in blower, and an external bleeder works with the integrated brake chopper to dissipate excess energy. The unit accepts digital servo and resolver feedback, and its nominal current rating is 300 A. Separate control and mains inputs allow the low-power electronics and the inverter section to operate from their intended supply sources.

During rapid acceleration, the drive can reach a peak output of 212 A, enabling short bursts of high torque for demanding axis moves. The bleeder circuitry and brake chopper reject up to 2250 W of heat, so cabinet airflow must be sized to remove that thermal load. The assembled unit weighs 150 kg, which usually requires secure mounting support and appropriate handling provisions during installation. Additional space is also needed around the drive so the cooling airflow can move through the cabinet without obstruction.