Product Description:

The DKR02.1-W300B-BE74-02-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat within the DKR Drive Controllers series. It conditions three-phase mains power and delivers regulated output to large synchronous or induction motors while accepting digital servo and resolver feedback from the axis. In automated lines, the device links motion profiles from the central control system to the mechanical load, providing closed-loop positioning, speed regulation, and energy management for high-inertia tools and transport mechanisms.

Communication with the supervisory PLC occurs over the SERCOS interface, allowing cycle-synchronous parameter updates and diagnostic reporting. At a 4 kHz switching frequency, the power stage supplies a continuous armature current of 141 A, corresponding to around 55 kW of continuous mechanical output when paired with a compatible motor. To absorb regenerative energy during deceleration, the controller incorporates an internal bleeder circuit that passes excess DC-bus voltage to a brake resistor rated for 1.5 kW of continuous thermal load and capable of accepting up to 240 kWs of braking energy in short bursts. Control electronics are fed by an isolated 230 V AC supply with a ±10% tolerance, and the power section is cooled by an integrated blower that forces air through the heat sink.

During transient moves, the inverter can deliver a peak output of 212 A, which matches the unit's 300 A current class. The mains side accepts 3xAC 400–480 V lines within a ±10% tolerance, aligning the controller with standard plant supply networks. Thermal loss power is 1800 W, which the air-cooling path removes to keep semiconductor junctions within safe limits. Despite its high power density, the controller weighs 104 kg. The unit is Version 1 in Line 02 and supports resolver or digital servo feedback processing together with internal braking hardware.