Product Description:

The KDA 3.1-050-3-AQD-W1 is a spindle drive manufactured by Bosch Rexroth Indramat and part of the KDA Spindle Drives series. It interfaces directly with the machine control to regulate spindle torque and velocity during milling, turning, or boring processes, converting DC link energy in the cabinet into a controlled three-phase output for the attached motor. By handling the acceleration and braking profiles requested by a PLC or NC kernel, the unit supports precise tool engagement, stable spindle response, and repeatable surface finishes in automated machining centers.

The drive draws a continuous output of 50 A, a rating that indicates the allowable motor current without thermal derating during steady cutting loads. Its power section is energized from a shared bus at 300 VDC, so the unit pairs with supply modules that provide this nominal link voltage. An integral heatsink blower operates from an auxiliary line of 220 V, 50/60 Hz, which allows airflow to continue even when the DC bus is disabled. Heat is removed by a mounted heatsink blower, and the overall cooling method uses forced cooling to move ambient air across the fins. Speed modulation is achieved through an analog command channel, allowing a velocity-proportional voltage or current from the motion controller to set spindle speed in real time.

The unit can be installed where ambient temperatures remain within 5 to 45 °C, helping keep semiconductor temperatures within their normal operating range. Functional accuracy is retained up to 1000 m above sea level, because higher elevations reduce air density and lower the cooling effect of the blower. In position-indexed threading or orient-stop cycles, the controller may supplement the speed loop with a digital position command value interface, allowing absolute spindle orientation before tool changes or tapping operations and supporting processes that require the spindle to stop at a known angular position.