Product Description:

The KDA 3.2-150-3-API-U1 is a spindle drive module from Bosch Rexroth Indramat's KDA Spindle Drives series. It is in hardware series 3 and version 2, and it converts regulated DC-link energy from an Indramat supply unit into three-phase power for high-speed machine-tool spindles. This supports precise torque and speed control in automated machining centers, and it also helps maintain stable spindle behavior during acceleration, threading, milling, and other closed-loop motion tasks. A dedicated heatsink blower and multiple encoder interfaces support continuous-duty operation where direct spindle feedback is required.

Its intermediate circuit operates on 300 VDC, and the power stage can deliver a continuous current of 150 A, so the connected motor must be matched to the drive's electrical and thermal capability. The heatsink blower is supplied from an auxiliary line of 115 V/50–60 Hz, which helps keep the internal temperature stable during operation. Cooling is provided by a mounted heatsink blower working with forced cooling paths, so waste heat is directed out of the module frame instead of collecting around nearby electronics. A second encoder input accepts spindle or auxiliary motor feedback, and an incremental encoder output can pass real-time position data to an external numerical controller for synchronized motion.

The unit operates in ambient air between 5 to 45 °C and at elevations up to 1000 m above sea level without derating. The speed command channel uses an analog voltage, which supports retrofits of older control systems that do not use fieldbus communication. Diagnostic timing can be shared through the incremental encoder output, and the additional encoder input allows a second feedback source for applications that use tandem or auxiliary axis arrangements. The module is intended for spindle-drive service in compact machining equipment where accurate speed regulation and direct feedback handling are required.