Product Description:

The KDA 2.1-150-3-D0I-W1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. In machining centers and grinding systems, it converts digital speed commands into controlled three-phase output for high-speed motor spindles. Closed-loop regulation of torque and velocity helps the spindle maintain commanded speed during rapid load changes and supports consistent cutting accuracy. This operating role suits machine processes where speed stability affects surface finish, dimensional repeatability, and response to changing cutting forces.

This drive is supplied from a DC bus of 300 VDC and can deliver a continuous output of 150 A, allowing it to run large-frame synchronous or induction spindles without derating. Speed reference data arrive through a 16-bit parallel digital port, which avoids analog drift and improves command resolution during speed changes. Internal circuitry remains functional between 5 to 45 °C, and the heat sink blower is powered by an auxiliary supply of 220 V at 50/60 Hz to keep semiconductor temperatures within operating limits. The combination of current capacity and digital command input supports stable spindle control during acceleration, steady cutting, and recovery after sudden load disturbances.

Cooling is provided by forced cooling with a mounted heat sink blower that pushes air across the fin channels instead of relying on passive cabinet airflow. The drive can operate up to 1000 m above sea level in most industrial locations. Encoder feedback for downstream CNC systems is available through an incremental encoder output, but this version does not include a second encoder input, so any dual-loop arrangement must be handled externally. The encoder output can be routed to the control system for speed monitoring or synchronized motion functions while secondary feedback is processed by separate external hardware.