Product Description:

The DKR02.1-W300B-BE41-02-FW is a Digital Intelligent AC Drive Controller produced by Bosch Rexroth Indramat within the DKR Drive Controllers series. It provides closed-loop regulation for high-power servo and spindle axes in automated machinery by converting three-phase mains power into controlled output for induction or permanent-magnet motors. The unit includes an internal bleeder so surplus regenerative energy can be dissipated without external hardware, and it communicates with higher-level motion systems through the SERCOS interface for real-time setpoint exchange. This arrangement suits machine tools, handling systems, and other equipment that require coordinated motion and stable speed control. Its closed-loop architecture lets the drive correct deviations between commanded and actual motor behavior during acceleration, deceleration, and steady operation.

The drive operates from a rated power bus of 3xAC 400–480 V (±10%) while its logic circuits are supplied by a separate AC 230 V (±10%) control voltage. The separate control supply keeps the logic section powered independently of the main power bus. At a 4 kHz PWM frequency, the inverter can deliver a continuous phase current of 141 A and briefly reach a peak of 212 A, enabling rapid torque transients. Those current capabilities correspond to a continuous mechanical output of 55 kW, matching the model's 300 current rating code. Motor position is returned to the controller through digital servo or resolver feedback, and a built-in air blower forces air through the heat sink channels so that losses are removed without external cooling equipment.

The integrated brake resistor handles a steady thermal load of 1.5 kW and can absorb up to 240 kWs of braking energy in a single stop, allowing frequent rapid decelerations on vertical or high-inertia axes. This helps manage returned energy during repeated braking cycles. Overall heat dissipation from semiconductors and magnetics is rated at 1800 W, which is used to size cabinet airflow. The controller weighs 104 kg, which affects panel reinforcement and handling. The unit is design version 1 in Line 02.