Product Description:

The DKR04.1-W400 is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat and is part of the DKR Drive Controllers series. The product is part of line series 04 and uses design version 1 electronics. Within an automation cell, the unit closes the power loop between a motion control system and high-power motors, issuing precisely timed three-phase output to govern torque, speed, and position in presses, machining centers, and gantry axes. Its control architecture is intended for demanding axes that require stable current regulation during rapid load changes.

At a switching frequency of 4 kHz, the controller supplies a continuous armature current of 210 A, which is the maximum steady-state motor load it can handle without overheating. Under the same conditions, it can deliver around 93 kW of electrical output to support heavy servo axes from a single cabinet module. Logic and interface circuits are powered separately from an AC 230 V ±10% control supply, which helps keep regulation stable when the main power section is disturbed. Internal temperature is managed by a built-in air blower, so no external ductwork is required. The W400 code indicates a current rating of 400, which helps with the selection of conductors, fuses, and contactors connected to the drive.

During acceleration, the power stage can reach a peak output of 282 A, giving the machine short-term torque reserve above the continuous limit. The DC bus is created from an incoming 3 x AC 400 to 480 V ±10% supply, allowing direct connection to common factory power systems. When running near maximum output, the combined semiconductor and magnetic losses release about 2500 W of heat, so cabinet ventilation must remove that heat during operation. The assembled chassis, blower, and bus components weigh 150 kg, which means the mounting structure must support a substantial installed mass.