Product Description:

The KDA 2.1-100-3-APD-U1-115 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It conditions DC link energy for high-speed machine-tool spindles and delivers controlled three-phase output so machining centers can maintain stable speed and torque during cutting, drilling, and finishing operations. The unit is intended for closed-loop spindle control, where accurate feedback and command processing help the machine follow commanded operating points under changing load.

Internally, the drive is energized from a DC bus rated at 300 VDC, and its output channel sustains a continuous armature current of 100 A to support demanding spindle loads. A separate heat sink blower draws power from a 115 V/50-60 Hz single-phase supply, so cooling remains available independently of spindle demand. Permitted ambient temperature extends from 5 to 45 °C, and cabinet airflow must keep inlet air within that range during operation. Installation is permitted at elevations up to 1000 m above sea level, while higher locations require derating. A second encoder socket accepts spindle or auxiliary motor feedback, and the additional digital inputs support external command handling for coordinated machine control.

Heat generated by the power electronics is removed by a mounted heat sink blower, and the drive uses forced cooling so airflow is maintained whenever the controller is enabled. Speed reference arrives through an analog voltage input, while a discrete line carries the digital position command value for coordinated motion with CNC controls. In series 2, an internal source selector can power the blower even when the DC link is off, which helps maintain thermal management during standstill. This arrangement supports applications that use tool-changing spindles or other high-inertia spindle systems that need stable cooling and responsive command input handling.