Product Description:

The KDA 2.1-150-3-DPI-U1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It serves as the power stage between a CNC controller and a high-speed spindle motor, converting regulated DC-bus energy into controlled three-phase output for machining centers and turning applications. By regulating torque and speed in real time, the unit supports precise metal-cutting, drilling, and grinding processes in automated production lines. In machine tools, this allows the controller to hold programmed spindle speed during tool engagement and changing cutting loads.

The drive is supplied from a DC bus rated at 300 VDC, so cabinet power supplies must maintain that voltage under load. The power section can deliver a continuous phase current of 150 A, which sets the torque available from the connected spindle motor. A dedicated blower draws operating power from a single-phase source of 115 V/50/60 Hz, keeping heat sink airflow separate from the main DC bus. Speed references arrive through a parallel interface that accepts a 16-bit parallel digital command, allowing fine setpoint resolution. The permitted ambient operating temperature is 5 to 45 °C, which is suitable for normal industrial cabinet environments.

Thermal management relies on a mounted heat sink blower that forces air across the aluminum fins, which matches the drive’s forced cooling method and helps maintain output during heavy spindle acceleration. Installation is permitted up to 1000 m above sea level, which suits most industrial locations. For feedback, the control board provides an incremental encoder output to relay spindle position to supervisory equipment, and a separate second-encoder socket accepts signals for spindle feedback or an auxiliary motor. This arrangement supports applications that use both primary spindle feedback and an additional encoder channel without adding a separate interface module.