Product Description:

The KDA 3.2-050-3-DP0-U1 is a spindle drive developed by Bosch Rexroth Indramat for the KDA Spindle Drives series. It converts fixed DC-bus power into controlled three-phase output so machine tool spindles can maintain speed and torque with digital precision during cutting, drilling, and finishing work. In an automation cabinet, the unit receives setpoint words from a CNC controller and supports coordinated spindle positioning for machining tasks that require repeatable surface quality. This control method helps the spindle respond accurately to commanded speed changes without relying on an analog reference path.

The drive operates from a DC bus rated at 300 VDC and can deliver up to 50 A of continuous output current to the spindle motor. Thermal energy is removed by a mounted heat sink blower, and the blower motor uses an AC supply of 115 V/50/60 Hz to keep the power section within its operating temperature range. Speed reference data are transferred through a 16-bit digital parallel interface, allowing the controller to send absolute spindle speed commands without analog drift or conversion delay. Air drawn through the fin stack cools the IGBT devices evenly during sustained machining duty, which helps maintain stable operation under repeated load changes.

The internal air path uses forced cooling, which supports rated operation in ambient temperatures from 5 to 45 °C. Installation is permitted up to 1000 m above sea level, and operation above that height requires derating to account for lower air density. A secondary encoder channel can be used for spindle feedback or additional motor feedback, which supports high-resolution position control or tandem-motor arrangements. The standard housing already includes the required cooling hardware, so no separate cooling interface is needed for normal installation.