Product Description:

The KDA 3.1-150-3-L00-W1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. It supplies regulated power to high-speed motor spindles used in machining centers and other automated tooling stations. The drive links the motion controller to the spindle so rotational speed and torque can be controlled with digital commands. In machine-tool service, this allows the control system to match spindle behavior to cutting, drilling, milling, and similar processes while responding to changing load at the tool.

This unit can deliver up to 150 A of continuous output current to the connected spindle, which is the maximum steady-state motor load the drive can support without derating. Its internal power electronics are energized from a bus voltage of 300 VDC, which is supplied by an external power module in the same cabinet. Heat is removed by a mounted heatsink blower, and the drive uses forced cooling to move air through the fins instead of relying on natural airflow. Directed airflow across the heatsink helps remove switching and conduction losses from the power stage during extended operation. The blower motor is powered from an auxiliary source rated at 220 V/50–60 Hz, so a single-phase AC supply must be available in the enclosure.

The drive is approved for ambient temperatures from 5 to 45 °C, and installation is permitted up to 1000 m above sea level without reducing the current rating. This operating range suits typical indoor industrial installations where temperature and altitude stay within normal machine-room limits. Commanded speed values are transmitted over a fiber-optic SERCOS interface, which provides deterministic communication with the master controller and helps reduce susceptibility to electrical noise around high-power spindle equipment. The unit has no additional interface option, and it also omits a secondary encoder input. Because of that layout, spindle-orient or position feedback must be handled through the primary channel only, and the connection scheme remains limited to the required control and power circuits.