Product Description:

The KDA 3.1-150-3-LP0-W1 is a spindle drive built by Bosch Rexroth Indramat and placed within the KDA Spindle Drives series. It is intended to supply controlled three-phase power to high-speed motorized spindles, coordinating torque and speed commands from the CNC through the drive’s digital control framework. By integrating power conversion, thermal management, and encoder processing in a single housing, the unit simplifies cabinet layout for milling, drilling, and grinding equipment on automated production lines. The integrated encoder processing also allows the drive to respond quickly to changing spindle conditions during machining.

The power section operates from a bus voltage of 300 VDC, and it can deliver a continuous phase current of 150 A to the connected spindle motor. These electrical limits set the available torque range during heavy cutting and continuous operation. The unit is intended for ambient temperatures from 5 °C to 45 °C and for installation heights up to 1000 m above sea level. A dedicated heat sink blower is supplied from a single-phase auxiliary line rated at 220 V, 50/60 Hz, which helps maintain acceptable semiconductor temperatures during prolonged duty cycles.

The unit uses forced cooling with a mounted heat sink blower, so cabinet air does not need to pass through the drive itself. The factory configuration has no additional interface option, and speed commands are accepted exclusively through the SERCOS interface. A second encoder input is available for spindle feedback or supplemental motor feedback, allowing the controller to compare actual shaft position with commanded profiles during position-sensitive machining. This arrangement supports precise spindle regulation while keeping external wiring limited to the required control and feedback connections.