Product Description:

Bosch Rexroth Indramat manufactures the DKR02.1-W300Z-BE89-01-FW, a member of the DKR Drive Controllers series. The unit belongs to line series 02, carries design version 1, and uses a current rating of 300. Classified as a digital intelligent AC drive controller, it supplies regulated three-phase power to high-inertia servo and spindle motors used in machining centers, gantry loaders, and other automated axes where tightly coordinated motion is required.

The controller exchanges real-time commands with a master CNC or PLC through a SERCOS interface, a deterministic fiber-optic bus that maintains synchronized sampling across multiple drives. When the internal inverter is clocked at 4 kHz, it can furnish a continuous phase current of 141 A, enabling connected motors to deliver about 55 kW of mechanical power without derating. The power section is designed for a mains supply of 3×AC 400–480 V ±10%, while logic and relay circuits are energized separately by an AC 230 V control feed. Thermal regulation is handled by a built-in blower that forces air through the heat sink channels to keep semiconductor junction temperatures within allowable limits during continuous operation.

For rapid accelerations or decelerations, the inverter allows a momentary peak of 212 A, giving machinery additional torque capacity without requiring a larger frame size. These transients raise internal losses, producing up to 1800 W of heat that must be removed by the cabinet ventilation system. Positional accuracy is maintained because the drive evaluates digital servo and resolver feedback simultaneously, closing current, velocity, and position loops without auxiliary interface cards. Even with the cooling hardware and bus capacitors installed, the assembled package weighs 104 kg, so mounting rails and handling equipment must be rated accordingly.