Product Description:

The DKR04.1-W400N-BE74-02-FW is a digital intelligent AC drive controller produced by Bosch Rexroth Indramat as part of the DKR Drive Controllers series. It controls high-power servo axes in automated machinery by converting three-phase mains power into a regulated DC bus and then modulating that energy into precisely timed pulses for the connected motor. The unit is in Line 04 and Version 1, and it uses a rigid DC bus without a brake chopper, so braking energy must be dissipated externally. Its feedback channels accept both digital servo and resolver signals, which supports use with a wide range of Indramat motors for positioning, packaging, and metal-forming applications.

During continuous operation at a 4 kHz switching frequency, the controller can supply 210 A of output current and deliver approximately 93 kW of mechanical power when paired with a matching motor. Dynamic events such as rapid acceleration are supported by a peak current of 282 A, allowing short bursts of torque without exceeding thermal limits. The power stage is fed by a mains range of 3×AC 400 to 480 V ±10%, while the logic and I/O circuits use a separate AC 230 V ±10% control supply to help maintain stable regulation if the main line fluctuates. These ratings suit high-capacity drive systems that require strong current output and separate control power.

A built-in blower provides air cooling and moves enough airflow to remove the controller’s 2500 W of heat loss under rated load. Real-time motion commands are exchanged over the SERCOS interface, allowing fiber-optic communication between the drive and a CNC or PLC. The enclosure weighs about 150 kg, so cabinet mounting must account for both the static load and the required airflow path. This combination of cooling, communication, and physical size suits high-power installations where stable thermal performance and networked motion control are required.