Product Description:

The KDA 3.1-150-3-LYS-U1 is a Bosch Rexroth Indramat spindle drive in the KDA Spindle Drives series. It is built to energize and regulate high-speed machining spindles by converting a fixed DC link into a controlled three-phase output that follows velocity and position commands from the automation controller. The unit combines the power stage, control electronics, and cooling hardware in one rack-mount frame. It is intended for machine tools where precise spindle speed, orientation, and dynamic response affect surface finish and cycle consistency.

Internally, the drive operates from a DC bus of 300 VDC, and its power section is rated for 150 A of continuous output to support large spindle motors. That current capacity helps the drive handle acceleration, cutting load changes, and continuous rotation without early thermal limitation. Thermal stability is maintained by a mounted heat sink that is flushed by a blower powered by 115 V/50–60 Hz mains. The assembly uses forced cooling so the power components stay within safe operating limits during rapid speed changes and sustained load. Velocity reference data are transferred through the SERCOS interface, which provides deterministic communication with the motion controller and eliminates the need for analog reference wiring.

The permitted ambient operating range is 5 to 45 degrees Celsius, and installation is allowed up to 1000 m above sea level. For diagnostics and parameter access, the unit includes a serial interface (RS-232-C). The serial port supports local service communication and direct access to operating data. A dedicated connector provides a second encoder input and a synchronous input for applications that require additional feedback coordination. The drive is in series 3 of the KDA family, and the same heat sink blower also removes heat from the internal control boards to help maintain stable response during prolonged operation.