Product Description:

The KDA 3.1-050-3-DQI-W1 is a spindle drive built by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a dedicated spindle controller, it supplies regulated three-phase power to machine-tool motors, allowing precise speed adjustment during drilling, milling, or grinding operations in automated equipment. The unit accepts digital speed commands from numerical controls and uses its internal logic to modulate output, thereby linking the mechanical spindle directly to the automation program. This type of control helps the spindle maintain commanded speed during cutting loads that change throughout a machining cycle.

The power section is energized from a DC bus at 300 VDC, so drive cabinets running a common intermediate circuit can couple several axes without extra rectifiers. Motor windings may draw up to 50 A, which sets the continuous current capacity of the output stage and the continuous torque available from the connected spindle. Thermal energy is removed by a blower powered by 220 V, 50–60 Hz, so ventilation remains independent of the main DC link during spindle operation. Speed data arrive through a digital 16-bit parallel interface, giving the controller 65,536 discrete reference points for fine velocity resolution across the commanded speed range. Internal heat-sink channels guide airflow under forced cooling, maintaining stable semiconductor temperatures even during prolonged high-load cycles.

The drive is intended for standard industrial enclosures and operates within an ambient range of 5 to 45 °C without additional air conditioning. Reliable commutation feedback can be shared with the CNC through an incremental encoder output, simplifying closed-loop coordination with other axes and helping the control system track spindle position changes. The feedback path also supports synchronized interaction between the spindle and feed axes during contouring moves. Operation is permitted up to 1000 m above sea level, and the unit is in Series 3, so its parameter structure and diagnostics match other drives from the same generation.