Product Description:

Bosch Rexroth Indramat manufactures the KDA 3.2-100-3-A0S-W1, a spindle drive positioned in the KDA Spindle Drives series. The module forms the power interface between a regulated DC bus and the high-speed spindle motor of a machining center, controlling acceleration, braking, and steady-state speed with the precision required for continuous cutting operations. By integrating with a CNC controller, it delivers torque regulation and protects the motor from overcurrent or overtemperature conditions, making it a fundamental building block of automated milling, turning, and grinding equipment.

The drive draws its main energy from a 300 VDC supply rail and can deliver up to 100 A of continuous phase current, which limits the maximum shaft power the connected spindle can achieve. A separate blower circuit fed by 220 V 50–60 Hz forces air across the heat sink. This arrangement, identified as forced cooling, stabilizes internal temperatures during prolonged duty at high current. Speed regulation is commanded through an analog voltage, while setup and diagnostics are handled over a serial interface (RS 232 C). This combination supports real-time velocity loops and offline parameter adjustment without additional fieldbus hardware.

Permissible ambient conditions range from 5 to 45 °C, and operation remains unimpaired up to 1000 m above sea level, letting the drive serve most shop environments without derating. The control electronics interpret an analog speed command value, so interface circuits need only standard ±10 V generators. Cooling hardware is integrated as a mounted heat sink blower, requiring unobstructed air paths but eliminating reliance on cabinet fans. Because the unit offers no second encoder channel, feedback wiring stays simple, yet dual-loop applications must be addressed elsewhere in the system design.