Product Description:

The KDA 3.1-050-3-LQ0-W1 is a spindle drive produced by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. Designed for cabinet installation, the unit controls the speed and acceleration of AC spindle motors in machining centers, grinders, and similar equipment, helping maintain repeatable surface finishes and shorter cycle times in automated production lines. In multi-axis platforms, it serves as the dedicated spindle channel and operates separately from feed-axis drives.

Electrical energy is delivered to the drive over a DC bus rated at 300 VDC, and this voltage is used by the inverter section to create a three-phase output for the spindle. The current capability is 50 A, so connected motors can draw substantial acceleration and cutting torque without pushing the power stage beyond its thermal limits. To stabilize internal temperatures, the unit relies on forced cooling, and its aluminum body carries a mounted heat sink blower that pulls air directly across the transistor modules. That blower is powered from a separate utility feed of 220 V at 50/60 Hz, which isolates its operation from the DC link and allows continuous airflow even when the intermediate circuit is de-energized.

For correct operation, the surrounding air must stay between 5 to 45 °C, and installation is limited to 1000 m above sea level so cooling performance and dielectric spacing remain predictable. Speed commands enter the controller exclusively through the SERCOS interface, and no additional interface option is included, so all setpoints and diagnostics are routed over this fiber-optic fieldbus. The stated ambient range also requires cabinet mounting that matches the drive’s forced-air path, while the altitude limit helps prevent reduced air density from lowering blower cooling performance.