Product Description:

The KDA 2.1-100-3-DYS-U1 spindle drive is built by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It is a spindle drive with Series 2 hardware and is inserted in a CNC chain to translate numerical speed commands into regulated three-phase output for high-speed machine tool spindles. By combining velocity control, current limiting, and feedback management, the unit supports precise surface finishing and drilling operations in automated production cells. That role is important in machining centers where spindle speed must track commanded values closely during cutting, tapping, and speed changes.

Its power section is energized from a bus link of 300 VDC, and the output stage can deliver up to 100 A of continuous current to the spindle motor. The speed reference arrives as a 16-bit parallel digital word, providing fine resolution for setpoint updates from the CNC. Parameterization and diagnostics are handled through a built-in RS-232C serial interface, while motion feedback is supported by a second encoder input and a synchronous input that let the drive process auxiliary position or spindle orientation signals. This arrangement allows the controller to compare commanded and actual motion data during synchronized spindle tasks. These electronic channels support coordinated acceleration ramps and rapid reversal without exceeding thermal or current limits.

Thermal stability is maintained by a mounted heat sink blower that moves air directly across the power modules; the blower is supplied from a dedicated 115 V, 50/60 Hz source and operates in forced cooling mode to keep semiconductor junctions within acceptable limits. Reliable service is specified for ambient temperatures of 5 to 45 °C, and installation is permitted up to 1000 m above sea level without power derating. Continuous airflow across the heat-producing components helps reduce heat buildup during sustained spindle loading and frequent speed changes. This cooling arrangement supports placement in sealed cabinets next to other high-density converters and helps maintain stable operation in compact machining centers.