Product Description:

The KDA 3.1-050-3-AQI-U1 is a spindle drive produced by Bosch Rexroth Indramat and delivered within the KDA Spindle Drives series. In machining centers and other automated tooling stations, the unit converts analog speed reference signals into controlled three-phase output for high-speed motorized spindles, providing the torque and velocity regulation required for consistent cutting quality. The designation “3.1” reflects its firmware and hardware combination designed for cabinet mounting alongside other Indramat power modules.

Its output capability is anchored by a rated current of 50 A, allowing the drive to energize medium-frame spindle motors without saturation. The power section is supplied from a regulated intermediate circuit at 300 VDC, so the converter must be paired with a matching mains rectifier module. A dedicated heatsink blower runs from a separate 115V/50-60 Hz AC source; this auxiliary circuit supports the drive’s Mounted Heatsink Blower architecture. Because thermal energy is extracted through Forced Cooling, continuous operation at high switching frequencies can be maintained even inside densely populated cabinets. Hardware revision indicator “3” identifies the functional generation inside the KDA lineage.

The drive can be installed in production areas kept between 5 to 45 °C; operation outside this window may require derating or auxiliary conditioning. Altitude is limited to 1000 m above sea level so that internal components see no excessive reduction in air density. For feedback distribution, an incremental encoder output passes spindle position data to external positioning controls, while the speed loop accepts a analogue command value that ranges from –10 V to +10 V. These environmental and signaling constraints define safe integration limits for revision 3 units in the KDA Spindle Drives series.