Product Description:

The KDA 3.2-100-3-APS-W1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It converts a regulated DC bus into three-phase power for high-speed machine-tool spindles while coordinating speed and position feedback from the attached motor. Paired with an Indramat supply module, the unit forms the axis-level power stage that executes velocity loops in computer numerical control systems. Because the drive handles the spindle axis locally, the higher-level CNC can issue commands while the power stage manages current delivery and feedback processing at the machine.

The power stage delivers a continuous output of 100 A, allowing it to energize medium-frame spindle motors without derating. A stabilized link circuit of 300 VDC supplies this current, and the control electronics draw command and monitoring functions from the same bus. Thermal regulation relies on a heat sink blower that runs on 220 V/50-60 Hz power, and the unit uses forced cooling to move air across the fins during rapid acceleration cycles. Speed references arrive through an analog channel, while diagnostic data and parameter transfers are handled through a serial interface (RS-232-C). Provision for a second encoder input allows direct spindle feedback or additional motor feedback for closed-loop operation.

The drive operates in ambient temperatures from 5 to 45 °C and at elevations up to 1000 m above sea level without derating. Its signal chain processes the speed reference as an analog voltage, which matches legacy CNC controllers that use voltage-based commands. The drive is in Series 3 and uses version 2 circuitry. The dedicated heat sink blower and sealed electronics support installation in electrical cabinets that share power modules, provided the cooling air path remains unobstructed.