Product Description:

The KDA 2.1-100-3-DY0-U1 is a spindle drive unit manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. In automated machining centers, the drive converts the common DC bus energy into regulated three-phase power so that a milling or turning spindle can achieve commanded speeds and torques. Acting as a bridge between the numerical control and the motor, it processes digital speed commands and returns encoder feedback, enabling closed-loop regulation that maintains cut quality and reduces cycle time in continuous production.

A continuous output capacity of 100 A equips the unit to drive large-frame synchronous or induction spindles without current fold-back during heavy roughing passes. The intermediate circuit operates at 300 VDC, matching the standard power supply modules used across the Indramat automation platform. Thermal control relies on a dedicated heatsink blower that draws 115 V/50-60 Hz utility power; combined with the drive’s forced cooling mode, this fan maintains stable semiconductor junction temperatures even when cabinet airflow is restricted. The drive operates over an ambient range of 5 to 45 °C, so climate conditioning of the control room is not mandatory in most facilities.

Installation is permitted up to 1000 m above sea level with no reduction in current or frequency limits, simplifying deployment in elevated plants. The CNC issues a digital (16-bit parallel) speed reference, allowing 65,536 discrete velocity points and eliminating analog offset errors. Position feedback can be broadened through the integrated second encoder input, which also includes a synchronous track for master-slave phasing when multiple spindles share a tool. The drive includes no additional interface option, so expansion cards are not required.