Product Description:

The KDA 3.1-050-3-AQI-W1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it supplies regulated three-phase power to high-speed motors used on machining centers and similar automated equipment, converting bus voltage into the torque needed at the spindle shaft. The unit forms part of a modular drive package that includes a heat sink blower, DC link connections, and signal interfaces that relay real-time motor data to the machine controller. This arrangement supports stable spindle control during speed changes, load shifts, and continuous machining duty.

The drive operates from a DC link of 300 VDC and can deliver a continuous phase current of 50 A, allowing it to power medium-frame spindle motors without derating. An internal blower draws its supply from an AC tap rated at 220 V/50-60 Hz, and this dedicated source keeps the heat sink temperature within limits regardless of load. Reliable service is maintained in ambient conditions ranging from 5 to 45 °C, so the unit can be mounted in typical factory enclosures without auxiliary climate control. Thermal energy is removed by a mounted heatsink blower, positioning the air path directly across the fins and reducing recirculation inside the cabinet.

The cooling circuit uses forced cooling, so airflow is sustained even when spindle speed is low and natural convection is inadequate. Installation is specified up to 1000 m above sea level before any output correction is required, matching most plant elevations. Speed reference signals enter through an analog input, enabling straightforward pairing with standard CNC velocity loops. For feedback distribution, an incremental encoder output is available, allowing downstream axis controllers or diagnostic tools to monitor real-time spindle position without additional sensors. These features support integration with machine systems that require steady spindle response and direct signal access.