Product Description:

The KDA 3.1-150-3-AP0-U1 is a spindle drive assembled by Bosch Rexroth Indramat within the KDA Spindle Drives series. Designed for use in machine-tool and production centers, the drive converts DC link energy from a supply module into controlled three-phase power for high-speed spindle motors. By regulating torque and speed through an analog reference, it supports precise cutting, drilling, and grinding in automated machining processes. The modular layout lets the drive operate as part of a larger motion system in which the supply and spindle sections are arranged as separate units.

Internally, the power stage is sized for a nominal direct-current link voltage of 300 VDC, and its output bridge can deliver a continuous 150 A to the connected spindle motor. Thermal energy from the switching devices is removed by a mounted heat sink that uses forced cooling, and the blower is powered from 115 V / 50–60 Hz so airflow does not depend on the DC bus. Speed reference enters the control board as an analog signal, which makes the unit suitable for systems that still use conventional analog command channels. Field wiring is simplified by the lack of an additional interface option, so essential connections remain on the standard front panel.

The drive is intended for installation where ambient temperatures remain between 5 to 45 °C, allowing the power section to operate within its expected thermal range when the blower is running. Operation is permitted up to 1000 m above sea level, and higher mounting locations require derating because reduced air density lowers cooling effectiveness. A dedicated second encoder input lets the controller process spindle position feedback or a separate motor feedback channel. This extra feedback path supports functions such as spindle orientation during tool changes without requiring another module slot.