Product Description:

The DKR04.1-W400E-BE56-01-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat and supplied within the DKR Drive Controllers series. Designed for high-power servo axes, the unit regulates three-phase induction or synchronous motors in material-handling machinery and large machining centers. It executes closed-loop velocity and position control, exchanging setpoints and status data with the host automation system to coordinate motion profiles and protect connected hardware.

At field level, communication is carried out through the SERCOS interface, allowing deterministic cyclic data exchange for multi-axis synchronization. When operated with a switching frequency of 4 kHz, its power stage delivers a continuous output current of 210 A, enabling a continuous mechanical output of approximately 93 kW from compatible motors. Internal logic and sensor circuits are powered by a control voltage of AC 230 V ±10%, while the main power section accepts a rated supply of 3 x AC 400–480 V ±10%. Thermal energy generated by the IGBT stack is expelled by a built-in air blower, a cooling method that maintains semiconductor junction temperatures without additional liquid circuits.

For dynamic braking events, the controller uses an external bleeder with a brake chopper connected to a rigid DC bus, allowing it to absorb momentary surges up to a peak drive current of 282 A without destabilizing the supply. The unit’s heat loss budget is specified at 2500 W, which helps guide cabinet ventilation and spacing around adjacent components. Digital servo and resolver feedback channels provide high-resolution speed information, and the unit is line series 04 with design version 1 and function module version 01. Despite its large electrical capacity, the controller ships as a single module weighing 150 kg, which simplifies mechanical integration into standard 600 mm deep control enclosures.