Product Description:

The KDA 3.2-050-3-LPD-W1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It converts a regulated DC link supply into three-phase power for high-speed machine-tool spindles while providing closed-loop velocity and position control through integrated command interfaces. Within an automation cell, the drive pairs with Indramat AC spindle motors to deliver accurate speed regulation required for milling, turning, or grinding processes.

The power section operates from a stabilized intermediate circuit of 300 VDC, allowing direct connection to Indramat supply modules without an internal rectifier. At a continuous output of 50 A, the converter can energize medium-frame spindle motors while preserving a thermal reserve for short accelerations. Velocity references are transmitted over the SERCOS interface, which carries fiber-optic telegrams to minimize noise inside the cabinet. For contouring tasks that require synchronized axes, a digital position command value input is provided so the motion controller can inject incremental position targets independent of the speed loop. A dedicated second encoder input accepts spindle feedback or auxiliary motor feedback and lets the device perform real-time error correction during threading or rigid tapping routines.

Thermal management is handled by a heat sink-mounted blower that draws ambient air across the drive's power semiconductors. The blower itself is powered from a 220 V / 50–60 Hz auxiliary source routed through the cabinet, and forced airflow maintains component temperatures so the unit can remain within an ambient window of 5 to 45 °C without derating. Installation is restricted to 1000 m above sea level, which maintains adequate air density for cooling and dielectric spacing at the stated voltage levels.