Product Description:

The KDA 2.1-050-3-LYI-W1 is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. The unit converts DC-bus energy into a controllable three-phase output that maintains precise speed and torque on motor spindles used in computer numerical control machining equipment. By translating digital speed references into drive current while monitoring encoder feedback, it stabilizes cutting conditions, reduces tool wear, and supports high-precision milling, drilling, and grinding operations in automated production cells.

Its power section is organized around a bus voltage of 300 VDC, providing a stable energy reservoir for rapid spindle acceleration and braking. A continuous output capability of 50 A lets the drive feed large-frame spindle motors without derating under typical cutting loads. Speed commands arrive through the fiber-optic SERCOS interface, giving the motion controller deterministic control over velocity profiles. For position tracking, the front panel exports an incremental encoder output, so auxiliary devices can observe real-time shaft position. A dedicated second encoder input is also provided, allowing dual-loop architectures where both motor and workpiece positions are monitored independently to sharpen contour accuracy.

An auxiliary supply of 220 V/50-60 Hz powers the blower, which is integrated as a mounted heat sink blower on the rear panel. This blower delivers forced cooling, moving air across the fins so internal semiconductor temperatures stay controlled within an ambient range of 5 to 45 °C. The drive can be installed at elevations up to 1000 m above sea level without output reduction, and its airflow path is arranged to allow side-by-side cabinet mounting with other KDA modules, keeping thermal interactions minimal in multi-spindle systems.