Product Description:

The KDA 3.3-100-3-DP0-W1 is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. In a CNC installation, this drive forms the link between the DC bus and a high-speed spindle motor, regulating torque, position, and velocity according to digital commands supplied by the machine controller. This arrangement lets the spindle accelerate, hold commanded speed, and react to load changes during machining cycles. A dedicated secondary encoder port is available for spindle feedback or additional motor feedback, allowing dual-loop operation when tighter spindle response or position correction is needed.

The internal power section is tied to a DC link of 300 VDC; this voltage is the energy reservoir from which the drive generates three-phase output for the spindle. Under continuous duty, it can deliver a rated output current of 100 A, which is the maximum steady load the connected motor can draw without derating. Speed reference data arrive on a Digital (16-bit parallel) channel, so the controller receives one discrete velocity word each cycle and can apply it without analog drift. The parallel command format supports direct transfer of speed data from the control without the signal variation associated with analog references. Thermal stability relies on a mounted heatsink blower; forced airflow pulls heat away from the IGBT modules and is powered by an auxiliary line of 220 V/50–60 Hz. The unit uses forced cooling, so the blower must remain active whenever the drive is enabled to prevent overheating at high current density.

Operation is permitted at ambient temperatures from 5 to 45 °C, helping keep semiconductor temperatures within an acceptable range during normal machine use. Installation is permitted up to 1000 m above sea level because thinner air above that height reduces cooling effectiveness. The model has no additional interface option, so its connection layout is limited to the standard functions provided on this version. The electronics are built to Series 3, which identifies the product generation used for this KDA design.