Product Description:

The DKR03.1-W100N-B is a digital intelligent AC drive controller produced by Bosch Rexroth Indramat as part of the DKR Drive Controllers series. It converts three-phase mains power into regulated armature power for compatible Indramat servo motors, so it serves as the power and control stage in machining centers, presses, and handling lines. It also regulates motor current and voltage so commanded torque and speed can be maintained during dynamic motion. The unit is in line 03 and version 1, which identifies its design group within the series.

At a 4 kHz switching frequency, the drive delivers a continuous phase output of 71 A, allowing connected servo motors to operate at rated load without derating. Under the same carrier frequency, its converter section can sustain 26 kW of mechanical power for mid-range spindle and gantry applications. Logic and signal circuits are supplied from an auxiliary input that accepts AC 230 V ±10%, so standard plant power can feed the control stage. Thermal energy is removed by a built-in air blower. The power section accepts 3×AC 400–480 V ±10% mains, allowing use on common industrial power systems. The model has a current rating of 100 A, which sets the permissible RMS output range before overload protection responds.

During acceleration, the drive can supply short-term overload current, and its DC link remains stable because it uses a rigid DC bus without a bleeder or brake chopper. The lack of an internal brake chopper means regenerated energy is not dissipated inside the unit by a braking circuit. At full regenerative duty, the enclosure releases 900 W of heat, so cabinet ventilation must remove a significant thermal load. Position and velocity loops are closed through digital servo and resolver feedback, allowing the controller to work with high-resolution encoders as well as standard two-pole resolvers without extra interface cards. Installation handling is affected by a unit mass of 49 kg.