Product Description:

The KDA 3.1-100-3-AP0-U1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Classified as generation 3 electronics, it regulates asynchronous or synchronous spindle motors used in CNC milling, turning, and grinding equipment. The drive accepts analog speed references from the numerical control and closes internal current and velocity loops to maintain commanded spindle behavior. By integrating the power section, control section, and a heat sink blower in one chassis, it reduces panel space and simplifies installation in machine tool cabinets. This arrangement supports stable spindle operation during changing cutting loads.

The power stage is energized from a common DC bus at 300 VDC, and it can deliver a continuous output of 100 A for rapid acceleration and deceleration of large spindles. Thermal management depends on an auxiliary blower fed by 115 V/50-60 Hz mains power; combined with the drive’s forced cooling mode, this airflow keeps semiconductor temperatures within operating limits during heavy cutting cycles. Speed regulation is commanded through an analog reference signal, so the unit can be connected directly to standard ±10 V CNC outputs without serial fieldbus hardware. All logic and feedback processing is handled internally because the order code specifies no additional interface option beyond the base terminals.

The drive uses a mounted heat sink blower that supports full current delivery across an ambient range of 5 to 45 degrees Celsius without derating. Installation is approved up to 1000 m above sea level, allowing operation at typical plant elevations. A second encoder input is available for spindle position feedback or for an additional motor encoder, which supports applications such as gear-shifted spindles or synchronized auxiliary axes. The base terminal arrangement supports these functions without requiring an extra option card.