Product Description:

The KDA 3.3-100-3-A0I-W1 is a spindle drive built by Bosch Rexroth Indramat and supplied within the KDA Spindle Drives series. It forms the power interface between a 300 VDC common bus and a three-phase spindle motor, executing speed reference signals that arrive on an analog channel. By supplying controlled current to the motor windings, the unit supports constant torque production for precision machining operations that require rapid acceleration, braking, and positioning.

The drive delivers a continuous output of 100 A, so cabinet wiring, fusing, and thermal design must accommodate this sustained current. Its internal power stage is energized from a 300 VDC intermediate circuit, which is typical for multi-axis systems running from a shared supply module. Thermal management is handled by a mounted heatsink blower; airflow is pulled across the heatsink fins to remove switching losses before they reach critical levels. That blower is powered by an external source rated at 220 V, 50/60 Hz, allowing the cooling fan to run even when the DC bus is de-energized. Spindle velocity is issued as an analog command, so the numerical control must provide a calibrated ±10 V or similar reference that represents the desired speed setpoint.

Environmental and interface features match typical machine-tool enclosures. The permitted ambient range of 5 to 45 °C prevents condensation while keeping semiconductor junctions within safe limits, and installation is specified up to 1000 m above sea level before derating becomes necessary. Feedback and diagnostic data can be forwarded through an incremental encoder output that replicates the spindle position to the CNC controller. There is no secondary encoder input, so dual-loop configurations must add an external summing module if optional sensors are required. The cooling mode is forced, and the design is identified as Series 3.