Product Description:

The DKR04.1-W400N-BE09-01-FW belongs to the DKR Drive Controllers series from Bosch Rexroth Indramat. It is a digital intelligent AC drive controller intended to govern high-power servo axes in metal-cutting machines, printing lines, and other automated assemblies that require coordinated multi-axis motion. By combining power electronics with signal processing, the unit converts the plant's three-phase supply into variable voltage and frequency that match the commanded motor torque and speed profile while exchanging status data with the cell controller through fiber-optic cabling.

The drive communicates with higher-level control systems over the SERCOS interface, providing deterministic cyclic data and parameter exchange through a single duplex ring. When the power stage switches at 4 kHz, it can deliver a continuous output of 210 A, translating to roughly 93 kW of mechanical power at the motor shaft. Internal logic and I/O circuits are supplied separately from the mains by an AC 230 V ±10% control voltage, so the controller can remain powered during line interruptions. Thermal management is handled by a built-in air blower; the integrated fan pulls ambient air across the heat sink and removes the need for external liquid cooling hardware.

For short acceleration bursts, the current can rise to 282 A without violating semiconductor limits, allowing the axis to overcome high inertial loads. The mains section accepts a three-phase source in the range of 3 x AC 400 to 480 V ±10%, matching common plant distribution voltages. During continuous operation, the power losses appear as about 2500 W of heat, so enclosure ventilation must accommodate this steady dissipation. Mechanical installation must also account for a mass of 150 kg, which requires cabinet frames and slide rails with adequate load capacity. The rigid DC bus configuration, the lack of a brake chopper, and support for both digital servo encoder and resolver feedback complete the controller's integration profile.