Product Description:

The DKR04.1-W400N-BE34-01-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat and delivered within the DKR Drive Controllers series. Intended for multi-axis machining centers and heavy automation, the unit converts three-phase mains power into regulated motor power while exchanging real-time motion commands with higher-level control networks during coordinated machine operation. By regulating current and voltage to large servo or spindle motors, it coordinates torque, speed, and position for demanding cutting, forming, and positioning processes.

Communication takes place through the SERCOS interface, allowing deterministic fiber-optic links to CNC or PLC masters. Under a 4 kHz current loop, the drive can supply 210 A continuously, providing the magnetic field strength required by high-torque motors. That current capability corresponds to a continuous mechanical output of 93 kW, so one controller can handle sizable cutting or forming axes with substantial load demand. Internal logic and fans use a control voltage of AC 230 V ±10%, while the power stage is fed from 3 x AC 400 to 480 V ±10% mains power. Thermal energy produced by the switching devices is removed by a built-in air blower, and the controller accepts digital servo and resolver feedback for closed-loop control from compatible motor feedback devices.

For short acceleration bursts, the unit delivers 282 A peak, matching the W400 current class and giving headroom for inertia-laden loads during rapid speed changes. Heat generated under those transients contributes to a total dissipation of 2500 W, which is important for cabinet ventilation calculations in enclosed drive systems. Despite its performance, the controller weighs 150 kg, so lifting equipment is typically required during installation and handling. The product is line series 04, design version 1, and function module version 01, and the absence of a brake chopper means an external dynamic braking resistor is required when regenerative energy exceeds the tolerance of the rigid DC bus.