Product Description:

The KDA 2.1-050-3-LPS-U1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It supplies controlled three-phase power to machine-tool spindles while exchanging motion commands and feedback with numerical controls. By closing the torque and speed loop inside the drive, it helps maintain stable spindle velocity during cutting operations and forwards position data to the controller for coordinated axis movement. The unit draws DC-link energy from an external supply module and includes its own cooling hardware for cabinet installation in production equipment.

Its internal power stage operates from a 300 VDC bus, so the drive requires a compatible upstream supply section. Under continuous duty, it can deliver a motor phase current of 50 A, which suits medium-power spindles used in milling, boring, or grinding machines. Speed reference data is transmitted through the SERCOS interface, providing deterministic fiber-optic communication for real-time setpoints. For service access, a serial interface (RS-232-C) is available for parameter transfer, and the blower is powered by a dedicated 115 V, 50/60 Hz single-phase feed so airflow is available as soon as mains power is present.

Thermal management uses a mounted heat sink blower that moves cabinet air across the drive and supports the internal forced cooling path of the power semiconductors. This arrangement keeps operating temperature within an ambient range of 5 to 45 °C during normal installation conditions. The drive can be installed at elevations up to 1000 m above sea level without output reduction, while higher elevations require current derating. An auxiliary encoder socket accepts a second feedback device for spindle orientation or for an additional motor, and the unit is version 2 within the series while retaining the same mounting dimensions.