Product Description:

The KDA 3.2-050-3-LPD-U1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a drive for machine-tool spindles, it converts DC bus energy into controlled three-phase output that regulates rotational speed and torque. When integrated into a multi-axis system, the unit allows CNC controllers to synchronize spindle motion with feed axes for cutting, drilling, or grinding processes that require repeatable speed control across the operating range.

The power section is supplied from a DC bus of 300 VDC. Its output stage is sized for a continuous line current of 50 A, giving the spindle enough dynamic torque for heavy material removal at high rpm. Heat generated by the switching devices is removed through forced cooling, and the dedicated heat sink fan runs from a 115 V 50-60 Hz auxiliary supply. Velocity references are transmitted over the SERCOS interface, enabling deterministic updates between the numerical control and the drive. This arrangement supports stable spindle response during commanded speed changes.

The operating temperature range is 5 to 45 °C, so cabinet ventilation must keep intake air within that band during continuous duty. Installation is permitted up to 1000 m above sea level without derating, which suits most factory locations. A digital position command value input coexists with the SERCOS channel and is used when the motion controller sends absolute position references rather than speed commands. The cooling hardware is a mounted heat sink blower integrated on top of the drive housing, which helps maintain airflow across the power modules while limiting panel depth. A second encoder socket is also provided for spindle or additional motor feedback when the application requires precise phase alignment for rigid tapping or synchronous machining.