Product Description:

The KDA 3.1-100-3-LYS-U1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Installed between a common DC bus and an asynchronous or synchronous spindle motor, the unit modulates current and frequency so machine tools can maintain constant cutting speed, accelerate rapidly, and stop precisely. Its control section coordinates with external motion controllers, while the integrated power stage handles high current density without separate transformer hardware. That arrangement lets the spindle follow commanded speed changes during drilling, milling, and turning cycles without relying on a separate power conversion stage.

The drive provides a rated current of 100 A from a DC link held at 300 VDC, giving stable voltage support during heavy cutting loads. Thermal energy is removed by a mounted heat sink blower powered from a 115 V/50–60 Hz auxiliary source, and the unit uses Forced Cooling. At ambient temperatures from 5 to 45 °C, the airflow helps keep the heat sink within its intended operating range during sustained spindle demand. Because the cooling air is supplied separately, the blower can continue supporting heat removal as the power stage regulates spindle current inside an enclosed cabinet.

The control board is Series 3 and supports the feedback and communication functions needed for closed-loop spindle control. Velocity commands are transmitted through a SERCOS interface, while diagnostic data can be exchanged through a serial interface (RS-232-C). A second encoder input with synchronous capture is available for applications that monitor absolute spindle position and reconcile resolver or incremental feedback signals during indexed motion. Installation is permitted up to 1000 m above sea level, where reduced air density does not require adjustment to the drive.