Product Description:

The KDA 2.1-150-3-AYS-W1 is a spindle drive developed by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a spindle drive, it supplies regulated three-phase power to high-speed motor spindles used in milling, drilling, and grinding centers, translating an analog speed command into precise rotor velocity. By integrating power conversion, closed-loop regulation, and thermal management inside one enclosure, the unit streamlines spindle control in automated machining cells. This supports machine tools that need stable spindle speed during cutting, tool changes, and changing load conditions. It is suited to machining centers that rely on repeatable spindle response across long production runs.

For continuous operation, the drive can deliver a rated output of 150 A to the connected spindle motor, while its internal DC link is maintained at 300 VDC. Heat generated by switching devices is removed through a mounted heat sink blower; this assembly draws ambient air across the fins and is energized from a separate 220 V, 50/60 Hz AC source. The airflow is part of forced cooling that keeps semiconductor junction temperatures within safe limits during high-current transients. Separate blower power helps maintain cooling without adding load to the main DC link.

The permitted operating climate ranges from 5 to 45 °C, and installation is specified for elevations up to 1000 m above sea level without current derating. Position feedback is expanded by a second encoder input, allowing simultaneous monitoring of a spindle-mounted encoder and a reference encoder for synchronous axes. Communication with supervisory controls is supported through an RS-232-C serial interface, while the drive interprets an analog speed command value for velocity reference. The analog reference sets spindle speed directly, and the serial connection supports parameter access and status exchange during operation.