Product Description:

The DKR04.1-W400E-BE37-01-FW drive controller is manufactured by Bosch Rexroth Indramat for the DKR Drive Controllers series. It is a digital AC drive controller used to regulate large synchronous and induction motors in machining centers, presses, and automated handling lines. By monitoring the DC bus and exchanging status data with a plant PLC, the unit delivers regulated three-phase output that matches commanded torque, speed, or position requirements. This makes it suitable for demanding motion tasks where stable current control and coordinated machine response are required throughout repeated operating cycles.

Communication uses the SERCOS interface, so real-time commands and status data move through a fiber-optic ring rather than conventional parallel wiring. Under continuous duty, the power section can deliver up to 210 A of output current, which corresponds to about 93 kW of mechanical power for connected machinery. Internal logic and I/O are supplied from a separate control circuit rated at AC 230 V with a tolerance of ±10 percent, helping isolate sensitive electronics from disturbances on the main supply. Thermal management is provided by a built-in air blower, which forces cooling air across the heat sinks to keep semiconductor temperatures within an acceptable range. Digital servo and resolver feedback channels are available, allowing the controller to support closed-loop operation without additional interface cards.

For short acceleration periods, the inverter can reach a peak armature output of 282 A, which supports rapid changes in motor speed before the load returns to continuous operation. The power stage accepts a mains supply of 3 x AC 400 to 480 V with a tolerance of ±10 percent, and regenerated energy is routed to an external bleeder through a brake chopper and rigid DC bus. Conversion losses appear as approximately 2500 W of heat, so cabinet ventilation must remove that thermal load to avoid derating during extended use. With a shipping mass of about 150 kg, the controller requires reinforced mounting. The unit is part of line series 04, design version 1, and function module version 01.