Product Description:

The KDA 2.1-100-3-L00-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It is designed to control high-speed machine-tool spindles by converting DC bus energy into precisely regulated three-phase output, while its integrated electronics exchange speed commands with motion controllers over the series communication link. In automated machining centers, this drive forms the interface between the central inverter cabinet and the motorized spindle, supplying regulated current and handling real-time feedback to maintain consistent cutting speeds. It is suited to applications where spindle speed must remain stable as cutting load changes during drilling, milling, and contouring operations. This supports repeatable surface finish and stable process behavior across long machining cycles.

Operation is based on a DC link that delivers 300 VDC to the power section, from which the unit can provide a continuous phase current of 100 A to the spindle motor. Thermal management relies on a mounted heat sink and a blower powered by a dedicated 115 V / 50–60 Hz supply; this arrangement supports forced cooling during extended duty cycles. Speed references arrive through the SERCOS interface, allowing accurate setpoint transmission during acceleration, braking, and contouring moves. Digital command transfer also helps avoid the drift and electrical noise that can affect analog reference signals in industrial cabinets.

The drive can be mounted at elevations up to 1000 m without performance adjustment and operates within an ambient range of 5 to 45 °C. The Series 2 control board comes with no additional interface option, so no supplemental fieldbus or diagnostic board is included. The unit also does not feature additional input, so the secondary encoder socket is omitted. This layout keeps the available connections limited to the standard control arrangement used by the drive in typical production environments.