Product Description:

The KDA 3.1-150-3-LYI-W1 spindle drive is built by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a spindle drive, it supplies regulated three-phase current to high-speed machining spindles, allowing precise torque and speed control in CNC centers and other automated equipment. The model follows the series 3 design revision and uses digital interfaces so it can coordinate with motion controllers during demanding production cycles. This operating role lets the control system adjust spindle behavior quickly as cutting load and commanded speed change during machining.

The drive draws DC bus power from a 300 VDC source, and its power section can deliver up to 150 A of continuous output current to the spindle motor. Thermal management relies on a mounted heat-sink blower, and the blower itself is supplied from a dedicated 220 V/50-60 Hz AC line. With forced cooling, air is directed across the aluminum fins to remove heat from the power section during extended high-load operation. A built-in incremental encoder output is provided so downstream numerical controls can read actual spindle position without an external splitter, which helps maintain stable velocity regulation and coordinated spindle response.

Installation is permitted at altitudes up to 1000 m above sea level and in ambient temperatures from 5 to 45 °C without derating. Speed commands are transferred over the SERCOS interface, which provides fiber-optic noise immunity and standardized telegram structures for complex multi-axis cells. For machines that require additional feedback, the drive includes a second encoder input and a synchronous input so the control system can compare more than one signal source during spindle orientation tasks. This arrangement supports synchronized motion functions where accurate feedback handling is necessary for repeatable spindle control.