Product Description:

The KDA 3.1-150-3-L0D-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed as a closed-loop power stage for motorized spindles, it supplies controlled torque and speed to machining heads and other high-speed axes in industrial automation systems. By converting DC link energy into a regulated three-phase output, the drive supports stable spindle operation during acceleration, steady cutting, and rapid deceleration in CNC-based equipment. Closed-loop regulation helps the spindle maintain commanded speed when cutting load changes, which supports consistent surface finish and repeatable cycle behavior.

At a DC link voltage of 300 VDC, the module can deliver a continuous output of 150 A, giving it the capacity to power medium-to-large spindle motors without immediate thermal overload. The heatsink blower operates from a dedicated 115 V at 50/60 Hz AC supply, which separates auxiliary cooling power from the main DC bus. Permissible ambient conditions span 5 to 45 °C, so enclosure airflow must keep intake air within that range during sustained operation. Installation is permitted up to 1000 m above sea level, where reduced air density can affect cooling performance at higher elevations. That separation also reduces the chance of auxiliary cooling demand interfering with the main power path.

Heat is removed by a mounted heatsink blower, and the drive uses forced cooling to move air across internal fins and dissipate semiconductor losses during rapid load changes. For command processing, the unit accepts a digital position command value channel and a SERCOS interface reference, allowing coordinated speed control and predictable communication with the motion controller. There is no secondary encoder socket, so the feedback arrangement is limited to the primary spindle sensor. This layout suits spindle applications that do not require a second measurement channel.