Product Description:

The KDA 3.1-150-3-A0I-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a regulated power module for high-speed machining spindles, it converts a fixed DC link voltage from a common supply into a current-controlled three-phase output that follows the analog speed reference from the CNC. The unit is installed inside the electrical cabinet and provides the controlled power needed for constant torque, fast acceleration, and coordinated spindle motion in industrial machine tools.

The drive operates on a DC link of 300 VDC, so the connected supply module must maintain this level for proper current regulation. Nominal torque delivery is supported by a continuous phase output of 150 A, which sets the continuous current capability of the power stage for matching spindle motors. Cooling is achieved through a heat sink-mounted blower that forces air across the power devices, and its fan is supplied from a separate 220 V/50-60 Hz source so airflow can remain available independently of the main DC bus. The controller receives its velocity command as an analog voltage, making it compatible with the spindle reference channels commonly used by CNC systems.

The permitted ambient temperature range is 5 to 45 °C, allowing operation in standard enclosed machine cabinets when normal ventilation is provided. Installation altitude is limited to 1000 m above sea level, because reduced air density lowers cooling effectiveness at higher elevations. For speed feedback, the drive provides an incremental encoder output so external control hardware can monitor actual spindle behavior without an added transducer. The unit has no second encoder input, which keeps the feedback arrangement limited to a single encoder channel and avoids unnecessary interface complexity in systems that do not require a second feedback source.