Product Description:

The KDA 3.2-100-3-DQ0-U1 is a drive unit manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. The designation places it in series 3 with revision 2, and it is intended to regulate the power supplied to high-speed spindle motors used in CNC machining centers and other automated tooling stations. By modulating the DC link voltage and monitoring feedback from the motion controller, the drive delivers precise torque and speed so that production equipment can cut, drill, or mill materials with repeatable accuracy.

The drive receives its intermediate circuit energy from a 300 VDC supply, and this voltage is switched by the internal power modules to control the motor phase currents. Under continuous operation, it can conduct up to 100 A, which is the maximum continuous current load the semiconductors are designed to handle. Thermal management relies on forced cooling provided by a mounted heat sink blower that is permanently attached to the backplate. That blower is fed from a 115 V 50–60 Hz auxiliary source, eliminating the need for an additional DC converter and allowing stable airflow independent of the main load. No additional interface option is included, so the signal wiring is limited to the standard command and feedback connectors.

The unit operates between 5 to 45 °C, so cabinet ventilation or heating may be required when temperatures approach either limit. Installation should not exceed 1000 m above sea level because reduced air density lowers the blower's cooling performance. A 16-bit digital parallel speed command interface links the drive to the numerical control, enabling fine resolution changes without analog drift. This model is released as version 2, which matches the component layout used for this product revision while retaining the same external dimensions.