Product Description:

The KDA 3.1-100-3-DQ0-W1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It converts the regulated DC link of a multi-axis cabinet into controlled three-phase output for motorized spindles used in metal-cutting and other high-speed machining centers. By handling real-time speed and torque commands, the unit forms the interface between numerical control electronics and the mechanical spindle, enabling precise acceleration, braking, and constant-speed operation during automated production cycles.

The drive draws its power from a 300 VDC intermediate circuit and can deliver up to 100 A of continuous output current to the connected spindle motor. Thermal management relies on an internal blower supplied with 220 V, 50/60 Hz, and it is fixed directly on the rear heat sink as a mounted heat-sink blower assembly. Airflow through the fins is actively pulled by this fan, a scheme classified as forced cooling, which maintains semiconductor junction temperatures when the converter is loaded near its rating. For reliable operation, the surrounding air must stay within 5 to 45 °C, so cabinet conditioning may be required in warmer facilities.

The module can operate at altitudes up to 1000 m above sea level without derating, so it can be installed in standard factory locations while maintaining insulation coordination rules. The speed loop receives its reference over a parallel bus formatted as a digital 16-bit value, giving fine resolution for commanded revolutions per minute and supporting consistent surface finish on machined parts. Because the hardware is supplied without an additional interface, integration focuses on this single command channel and the standard feedback sockets already provided in the KDA housing, simplifying wiring in control cabinets that contain multiple identical axes.