Product Description:

The KDA 2.1-150-3-A0D-W1 is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a dedicated spindle drive, it converts a regulated DC link into three-phase power for high-speed machine-tool spindles. It also manages thermal load so the spindle can accelerate, decelerate, and hold speed accurately during cutting cycles in automated cells and machining centers.

This unit is fed from a DC bus at 300 VDC, and the power section can deliver up to 150 A of continuous current to the motor windings, which matches medium-to-large spindle ratings. A separate blower mounted on the heat sink runs from a 220 V/50-60 Hz single-phase supply, and the combination of a heat sink-mounted blower with forced cooling keeps internal semiconductor temperatures within safe operating limits during sustained load. Reliable operation is specified from 5 °C to 45 °C, so enclosure airflow must keep the drive within that temperature range even when the surrounding plant is warm. The drive accepts an analog speed command, while dedicated logic circuits monitor current, temperature, and bus voltage before enabling gate signals to the inverter stage.

Installation altitude is limited to 1000 m above sea level, which helps maintain enough air density for effective cooling performance. For axis coordination, a separate channel carries the spindle position reference as a digital position command value, allowing CNC controllers to orient the shaft for tool changes or threading functions. Speed setpoints arrive through an analog input, which supports retrofit use in legacy control architectures. Because a second encoder socket is not present, external feedback devices must be wired directly to the master controller, which reduces wiring at the drive but requires careful routing in multi-turn applications.