Product Description:

The KDA 3.2-100-3-AP0-U1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. As a spindle drive, it supplies regulated three-phase power to high-speed machining spindles while receiving speed commands in analog form from the CNC or motion controller. Its type code places it in a configuration used with other Indramat axis modules in multi-axis rack systems for metal-cutting or woodworking centers.

The unit is supplied from an external DC bus rated at 300 VDC and can deliver a continuous output of 100 A to the spindle motor. Internal losses are removed by a mounted heat sink that is ventilated by a blower powered from a separate 115 V 50/60 Hz AC feed; this arrangement maintains semiconductor temperatures during sustained high-speed cuts. Reliable operation is permitted between 5 to 45 °C, so cabinet climate control is only required in hotter environments. Forced airflow across the heat sink allows the rated current to be maintained at elevations up to 1000 m above sea level without derating. The drive interprets analog speed references through differential inputs that are filtered to reduce noise coupling from adjacent axes or switching supplies.

Cooling performance is enhanced by the drive’s forced cooling mode, which keeps the blower running whenever the DC bus is energized rather than cycling with load. The drive also supports a tachometer or encoder feedback path, and a dedicated connector provides a second encoder input for spindle orientation or auxiliary motor feedback. The control rack includes no additional interface option, so the wiring layout remains simple for retrofit projects. When paired with a controller that issues an analog reference, the drive’s fast current loops and deterministic speed response support precise contouring without adding digital protocol overhead.