Product Description:

The KDA 2.1-050-3-LYS-W1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed for closed-loop control of high-speed machine-tool spindles, it converts a stabilized DC link into three-phase output while handling feedback, thermal protection, and fieldbus communication. Within an automation cell, the unit functions as the power stage that regulates spindle speed and torque according to commands from a CNC or PLC.

The drive’s power section operates from a regulated bus of 300 VDC, delivering energy to motor windings with minimal commutation delay. A continuous output of 50 A supports medium-horsepower spindles through heavy cutting passes without derating. Heat generated by semiconductor switching is removed by a mounted heat sink blower whose motor is supplied at 220 V at 50/60 Hz, isolating the cooling circuit from the control electronics. That blower provides forced cooling, so airflow remains constant even when the cabinet temperature is low. Velocity references are transmitted over the SERCOS interface, allowing the controller to align spindle speed with axis interpolation and maintain rigid tapping accuracy.

The installation envelope is bounded by an ambient range of 5 to 45 °C, ensuring stable component temperatures under typical workshop conditions. Functional integrity is maintained up to 1000 m above sea level, where air density still supports the blower’s cooling capacity. Parameters can be accessed through a RS-232C serial interface, allowing direct diagnostics and setup changes without disconnecting the drive. For motion sequences that require precise angular correlation between the spindle and auxiliary axes, the unit includes a second encoder input and a synchronous input, permitting feedback from a load-side encoder or a master encoder to refine position control.