Product Description:

The KDA 2.1-050-3-A0I-W1 is a spindle drive module produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a dedicated spindle drive, it converts controlled power from the centralized DC bus into three-phase output that controls motor torque and speed, allowing precise acceleration and deceleration of high-speed machine tool spindles. In automated machining centers, the device forms the electrical link between CNC control loops and mechanical cutting heads, supporting synchronized spindle motion during drilling, milling, or grinding cycles. This operating role allows the spindle axis to respond quickly to programmed speed changes while maintaining stable rotation under varying cutting loads.

The converter operates from a bus voltage of 300 VDC, so energy is drawn from a shared supply rather than individual rectifiers. Its continuous output capability reaches 50 A, enabling it to energize mid-frame spindles without current derating during steady operation. The heat sink blower that cools the power stage is fed from 220 V, 50/60 Hz auxiliary mains, which keeps the fan load separate from the DC link. Heat is removed by a mounted heat sink blower attached to the drive chassis. The unit uses forced cooling to maintain acceptable temperatures in the power devices during prolonged duty cycles.

Spindle velocity is requested through an analog speed reference, which simplifies integration with proportional CNC outputs and supports smooth setpoint ramps. For monitoring, the drive provides an incremental encoder output that passes motor position data to CNC controls for high-resolution speed supervision. The feedback signal can also be used by the control to verify actual motion and coordinate spindle behavior with feed-axis movement during machining. The unit is intended for ambient temperatures from 5 to 45 °C, allowing installation in most shop-floor cabinets without added heating. Installation is permitted up to 1000 m above sea level, which suits typical industrial elevations.