Product Description:

Bosch Rexroth Indramat manufactures the KDA 3.1-100-3-LY0-W1 in the KDA Spindle Drives series. The unit controls the torque and speed of machine-tool spindles, linking CNC commands to the motor through digital channels. It supplies regulated three-phase power while monitoring feedback so cutting, drilling, and grinding processes maintain constant surface speed. Its modular housing fits mid-range machining centers and lathes, and the slide-in format allows installation in Indramat power racks without special mounting hardware. Closed-loop operation also helps the spindle respond quickly to changing load during acceleration, deceleration, and tool contact.

The drive accepts 300 VDC from the common supply bus. During continuous duty, it can deliver 100 A of armature current, allowing the spindle motor to produce substantial cutting power. Heat is removed by forced cooling; an integral fan moves air across the heat sink and is powered from a separate 220 V at 50/60 Hz circuit so ventilation can remain active when the DC bus is off. Separate fan power also helps remove stored heat after a heavy run. Speed references come through the SERCOS interface, providing deterministic communication between the axis and the numerical control. The unit is release 3, which places it in the later version of this drive design.

For reliable service, the drive must operate between 5 to 45 °C and below 1000 m above sea level; beyond these limits, output is derated. The mounted heat sink blower exhausts rearward, so the enclosure needs a clear outlet path to prevent hot air from recirculating around the module. The unit also includes a second encoder input and a synchronous input for external position feedback, supporting spindle orientation during tool changes and other functions that require a controlled stop angle. These inputs allow the control to track spindle position more precisely when the application calls for alignment with mechanical tooling.