Product Description:

The KDA 2.1-150-3-LP0-U1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a dedicated spindle controller, it supplies regulated three-phase power to high-speed machining or grinding motors, converting DC-link energy into the dynamic voltage and frequency patterns required in CNC automation. The drive sits between the machine control and the spindle motor, interpreting SERCOS command frames and adjusting torque in real time so cutting speed, surface finish, and tool life remain consistent under varying load conditions.

Internally, the drive draws from a DC bus rated at 300 VDC, and its output devices are sized for a continuous phase current of 150 A, allowing direct connection to medium-frame spindle motors that require high surge torque during acceleration. The heat generated by this switching stage is removed by a mounted heatsink blower. The unit uses forced cooling, so cabinet temperature rise is less likely to limit production duty cycles. Speed references arrive digitally over the SERCOS interface, which eliminates analog drift and provides deterministic cycle timing for coordinated multi-axis moves. The module is delivered without additional interface options, keeping communication on a single channel.

The heatsink blower is powered by an auxiliary supply of 115 V 50-60 Hz, separating thermal management from the main bus and maintaining airflow whenever the main contactor is open. Acceptable ambient conditions span 5 to 45 °C, and installation is permitted up to 1000 m above sea level. A dedicated spindle feedback channel is available through the second encoder input, allowing simultaneous monitoring of the motor position and a load-side encoder when required for threading or orientation tasks. The product is Series 2 and Version 1.