Product Description:

The DKR02.1-W300B-BE76-01-FW is an AC drive controller produced by Bosch Rexroth Indramat within the DKR Drive Controllers series. It belongs to the Digital Intelligent AC Drive Controller group and is intended for closed-loop control of large servo motors and spindle drives in industrial automation. The unit converts three-phase mains power into regulated motor output and coordinates motion through its integrated command and feedback functions. This arrangement supports coordinated speed and position control on heavy machine axes.

Power is supplied through a three-phase input of 400–480 V AC ±10%, while an auxiliary control circuit accepts 230 V AC for logic functions. At a switching frequency of 4 kHz, the drive delivers a continuous output current of 141 A and sustains up to 55 kW of mechanical power without derating. Short-term load surges are handled by a peak current capability of 212 A. Motion commands arrive over the SERCOS interface, and the controller interprets both digital servo and resolver feedback to close the velocity and position loops. An internal bleeder resistor is factory-installed, and excess DC-bus energy is dissipated by the built-in blower using forced-air cooling to keep semiconductor junction temperatures within limits.

The internal brake resistor has a continuous thermal rating of 1.5 kW and can absorb up to 240 kWs of kinetic energy during rapid deceleration cycles before duty limits are reached. Overall losses from the power stage and blower amount to 1800 W, so enclosure ventilation must be sized accordingly. Mechanical handling requirements are influenced by the assembled mass of 104 kg, and mounting hardware must support this load while maintaining clear airflow paths for the blower. These operating values are relevant where repeated braking and sustained current demand place a heavy load on the drive system.