Product Description:

The DKR04.1-W400N-BE32-01-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat and belongs to the DKR Drive Controllers series. The unit converts three-phase mains power into regulated current for large servo and spindle motors used in automated machining centers, press drives, and material-handling systems. By processing velocity and position data from digital servo or resolver feedback, the controller delivers precise torque and speed commands for coordinated multi-axis motion. Its modular housing and integrated blower support installation in high-power control cabinets where stable thermal performance is required.

The drive delivers a continuous output of 210 A at a 4 kHz carrier frequency, which is the steady-state current available to the connected motor without derating. At the same switching frequency, the power stage can provide approximately 93 kW, indicating the available power for sustained operation under normal production conditions. For short transients, the inverter supplies a peak current of 282 A, which helps during acceleration and sudden load changes. Mains connection is specified for 3×AC 400 to 480 V ±10%, allowing connection to common industrial supply networks. A separate control-logic supply of AC 230 V ±10% keeps the internal electronics and fieldbus interface active even when the power stage is isolated. The DC bus does not include a brake chopper, so regenerative applications require external energy-dissipation components.

Thermal management is handled by an internal blower that forces air cooling through the heat-sink channels, and the resulting airflow supports a maximum loss power of 2500 W under rated conditions. The enclosure mass is 150 kg, which reflects the heavy power electronics and laminated bus structure used for this current class. Communication with higher-level motion controllers is carried over the SERCOS interface, allowing deterministic cyclic setpoints and diagnostic exchange. This arrangement supports precise synchronization between the drive and the rest of the motion system.