Product Description:

The DKR03.1-W100N-BE31-01-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat and assigned to the DKR Drive Controllers series. It regulates three-phase servo and spindle motors, providing precise torque and speed control for machining centers, packaging equipment, and other automated production cells. By modulating DC bus energy and coordinating with external motion controllers, the device serves as the central power stage that converts the plant’s mains supply into controlled motor currents.

Communication with higher-level control systems is handled through the SERCOS interface, allowing deterministic cycle times and parameter transfer over a single fiber-optic ring. At a switching frequency of 4 kHz, the drive can deliver a continuous and peak output of 71 A, which supports dynamic axis loads while keeping thermal stress within limits. The power section is rated for approximately 26 kW of continuous mechanical output and is supplied from 3x AC 400–480 V mains with a tolerance of ±10%. Internal logic circuits are powered separately at AC 230 V, so the control electronics remain operational during line disturbances. The unit uses a rigid DC bus without a brake chopper, so regenerated energy must be absorbed by the connected supply or an external resistor network.

The thermal design uses a built-in air blower to remove conversion losses that reach 900 W under full load. This forced airflow keeps semiconductor junctions within their operating limits while maintaining the unit’s stated weight of 49 kg, which is relevant for cabinet mounting. Position and velocity control use digital servo and resolver feedback, allowing the controller to work with high-resolution incremental data as well as absolute rotor angle information without rewiring. The unit is in line series 03, design version 1, and function module version 01.