Product Description:

The DKR03.1-W100N-BA31-01-FW is an intelligent AC drive controller produced by Bosch Rexroth Indramat and supplied in the DKR Drive Controllers series. In multi-axis machining centers, material-handling gantries, or press automation, this unit supplies regulated three-phase power and closed-loop control to synchronous and induction motors while coordinating speed, torque, and position demands from a higher-level CNC or PLC. By combining motion control and diagnostics in one unit, it replaces discrete contactor panels and simplifies cabinet wiring for high-power servo axes. This arrangement also helps connected axes maintain stable operation when load conditions change during production.

The power channel delivers a continuous armature current of 71 A at a 4 kHz switching frequency, enabling sustained acceleration of large rotary loads without thermal derating. Under the same carrier frequency, the inverter section can output about approximately 26 kW of mechanical power, which indicates the maximum steady shaft load the connected motor may draw during production cycles. Logic circuits and internal fans share a separate control supply of AC 230 V, ±10%, so auxiliary transformers are often unnecessary inside the cabinet. Motion commands enter through an analog interface, allowing velocity, torque, or position setpoints to be sent as ±10 V references from higher-level control equipment. The main power bus accepts 3 x AC 400 to 480 V, ±10%, letting the device operate on standard factory mains while a rigid DC link reduces energy loss in dynamic applications.

The thermal model assumes 900 W of losses at rated load, and these are removed by a built-in air blower that forces cooling air across the heat sink. Position feedback from the attached motor is processed through digital servo and resolver feedback, giving the controller automatic recognition of encoder type and supporting combined velocity and commutation loops. A rigid DC bus is supplied without a brake chopper, so braking energy must be handled externally when regenerative peaks exceed the nominal current rating. Overall mass is 49 kg, which is important when mounting the unit on swing-out frames or back panels.