Product Description:

The KDA 2.1-150-3-APD-W1-220 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It converts a fixed DC link into controlled three-phase power so that high-speed machine tool spindles can accelerate, decelerate, and hold speed precisely during cutting or grinding cycles. By integrating with CNC controllers, the unit supplies regulated current to the motor while an onboard blower moves waste heat away from the heat sink. This arrangement supports spindle applications that need stable speed during changing cutting loads, including machining steps that alternate between rapid acceleration and steady rotation.

The power section delivers a continuous output of 150 A from a DC link held at 300 VDC. Thermal loading is controlled by forced cooling through a mounted blower that draws an external supply of 220 V at 50/60 Hz, so fan power remains separate from the DC bus and airflow does not depend on spindle operating state. The electronics are intended for ambient conditions from 5 to 45 °C, allowing the drive to be installed beside other motion modules when normal shop temperatures are maintained. The separate blower supply also helps keep cooling consistent during idle periods, startup, and low-speed operation.

A digital position command value input lets a motion controller issue fine incremental moves, while the primary speed loop can be fed with an analog voltage or current setpoint for rapid override or manual jog functions. For applications that need exact spindle orientation, the unit offers a second encoder input for spindle feedback or additional motor feedback, which supports phase alignment during tool changes or rigid tapping. This extra feedback path is useful when the machine must verify spindle position before the next motion step begins. Installation is permitted up to 1000 m above sea level; above that height, reduced air density limits blower performance and the drive requires derating.