Product Description:

The KDA 3.2-050-3-AP0-U1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It belongs to the 3.2 hardware generation within that series. The unit is supplied as a dedicated spindle controller for high-speed machining centers and similar industrial automation tasks where precise torque and speed regulation of motorized spindles is required.

This model operates from a DC bus of 300 VDC and can deliver a continuous output of 50 A to the connected spindle motor. Thermal energy is removed through a heat sink-mounted blower, and the blower is energized by an auxiliary source rated at 115 V, 50/60 Hz. Airflow is directed across the fins in a forced cooling mode to keep semiconductor temperatures within design limits during sustained cutting loads. Speed reference is accepted as an analog command voltage, allowing straightforward integration with conventional CNC controllers. No additional interface modules are fitted, so field wiring is limited to the standard power, control, and feedback terminals.

Permitted ambient temperature ranges from 5 to 45 °C, and installation can be performed at elevations up to 1000 m above sea level without derating. A dedicated secondary encoder input is provided, and this second encoder input can process spindle feedback or an extra motor transducer for synchronized axes. The drive’s cooling scheme depends on clean cabinet air, so forced ventilation should be maintained under all duty cycles. Because there is no additional interface option, auxiliary I/O must be routed through the main control rack instead of the drive housing. Analog speed references, combined with the 3.2 series hardware, give predictable dynamic response for threading, drilling, and contouring applications where constant surface speed is critical.