Product Description:

The KDA 2.1-050-3-DQS-U1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It is designed to supply and regulate high-speed machine-tool spindles, converting common DC-bus energy into controlled three-phase output while monitoring torque and velocity. By integrating current control, speed feedback, and protective diagnostics in one enclosure, the unit supports spindle automation on milling, drilling, and grinding machines. This type of control is useful where spindle speed must remain stable as cutting load changes during machining. The enclosure combines power conversion and supervision functions so the spindle can respond quickly to command changes from the machine control.

The drive operates from a common DC link at 300 VDC and can deliver up to 50 A of continuous output current to the connected motor windings. Thermal management is handled by a mounted heat sink blower. This blower is powered from 115 V AC, 50–60 Hz, and the drive uses forced cooling to keep semiconductor temperatures within limits during heavy duty cycles. Spindle speed references are accepted as a digital 16-bit parallel word, allowing fine resolution over the full speed range without analog drift. A built-in RS-232-C serial interface supports parameter upload and status retrieval through a computer or higher-level controller.

The drive supports ambient temperatures from 5 to 45 °C without output derating when the cabinet provides unobstructed air intake for the blower. Elevations up to 1000 m above sea level are permissible for operation in most production facilities. Its internal designation of Series 2 indicates the second design release. Proper cabinet ventilation is important because restricted airflow reduces the blower's ability to move heat away from the power section. The mounting pattern, enclosure depth, and connector layout follow the established housing format, which helps maintain consistent panel layout and cable routing.