Product Description:

The DKR04.1-W300N-BE56-01-FW is an AC drive controller produced by Bosch Rexroth Indramat within the DKR Drive Controllers series. As a digital intelligent unit, it supplies regulated three-phase power to large electric servomotors used in gantries, presses, and other coordinated industrial axes. It provides closed-loop current and velocity control while exchanging setpoint and status data with higher-level automation through its fiber-optic command channel. By converting incoming line power into precisely timed pulses, the controller enables dynamic positioning and energy-efficient speed regulation across demanding motion profiles.

The drive communicates through a SERCOS interface, allowing deterministic bus cycles for synchronized multi-axis control. At a 4 kHz switching frequency, it can sustain 185 A of phase current, translating into approximately 82 kW of continuous mechanical output when paired with a matching motor. Control electronics are powered from an AC 230 V auxiliary supply, while the power stage accepts 3 x AC 400 to 480 V with a tolerance of ±10%. Heat generated by the IGBTs is removed with an internal built-in air blower system, and the design omits a brake chopper so any regenerated energy must be managed by the rigid DC bus or external equipment. Digital servo and resolver feedback inputs support precise motor identification and tuning, and the nominal current rating is 300 A.

The controller can deliver a peak phase current of 212 A, supplying short bursts of torque during rapid acceleration. Even at these overload levels, its internal architecture restricts total thermal losses to 2250 W, a value that helps determine cabinet ventilation needs. Mechanical installation must account for the 150 kg shipping mass, so the housing's fixing points are designed for hoist attachment. The unit is design version 1 with function module version 01 and line series 04.