Product Description:

The KDA 2.1-050-3-L0I-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Designed for high-speed machining spindles, it delivers controlled three-phase power that keeps tool rotation stable under changing load conditions. By converting a regulated DC bus into precisely modulated output, the module supports accurate speed profiles and torque limits required in CNC milling, drilling, and grinding stations. Its internal diagnostics monitor phase current, heat sink temperature, and encoder feedback to help protect uptime. This closed-loop behavior helps the spindle maintain consistent cutting conditions when tool engagement or material hardness changes during a machining cycle.

In normal service, the drive delivers a rated output current of 50 A, allowing it to energize medium-power spindle motors without overloading the supply bus. The intermediate circuit is fed from a shared supply unit that maintains 300 V DC on the DC link, giving the controller predictable headroom for vector modulation and regenerative braking. Thermal management relies on forced cooling, implemented through a mounted heat sink blower that pushes air across the IGBT bridge. The enclosure includes an auxiliary connection that accepts 220 V at 50/60 Hz to power that blower. Independent blower power keeps the cooling function separate from the main DC link during operation.

The drive can be installed at elevations up to 1000 m above sea level without output derating, and reliable performance is maintained in ambient temperatures from 5 to 45 °C. For motion feedback, an auxiliary bus provides incremental encoder output, allowing downstream controls to monitor actual spindle speed directly. Command setpoints are received through the SERCOS interface, which supports deterministic digital control in CNC systems. The unit omits a second encoder input, which keeps the wiring layout simpler.