Product Description:

The KDA 3.2-050-3-D0S-U1 is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It is series level 3, version 2, and the product type is a spindle drive. The unit converts a regulated DC link into a three-phase output that governs high-speed machine-tool spindles, providing closed-loop speed regulation for automated milling, drilling, or grinding stations in factory lines. This operating role suits equipment that must hold spindle speed steadily as cutting conditions change during production. It is intended for industrial spindle applications that require repeatable speed response.

The power stage is rated for a continuous output of 50 A, allowing the drive to energize medium-frame spindle motors without derating during heavy cutting passes. It draws its intermediate circuit from a 300 VDC supply that originates in the associated supply module. Thermal management uses a dedicated 115 V at 50/60 Hz source for the blower, which helps keep the control electronics isolated from power-side disturbances. The airflow component is a mounted heatsink blower, and the unit uses forced cooling to maintain stable semiconductor temperatures when cabinet air is warm or internal spacing is limited. By moving air directly across the heat sink, the cooling system supports sustained operation during long machining cycles.

Installation is permitted in rooms where the surrounding air remains between 5 to 45 °C, and altitude must not exceed 1000 m above sea level so cooling performance remains consistent. For parameter loading and service diagnostics, the front panel includes a serial interface (RS-232C). Speed references arrive through a 16-bit digital parallel interface, which gives the controller fine resolution when adjusting spindle speed. A secondary encoder socket is omitted, so the drive relies on the primary feedback channel only. The primary channel therefore provides the feedback used during spindle operation.