Product Description:

The KDA 3.1-100-3-AP0-W1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a spindle-oriented controller, it supplies regulated three-phase power to high-speed machine tool motors and transfers position data from encoders back to the CNC control. A dedicated second encoder input lets the unit accept either spindle feedback or additional motor feedback so that synchronized positioning and orientation tasks can be carried out without separate hardware.

This model draws its intermediate circuit from a DC bus rated at 300 VDC, and it can deliver a continuous output of 100 A to the connected spindle motor. The integrated heatsink blower uses an auxiliary single-phase supply of 220 V/50–60 Hz; isolating the cooling fan from the DC link prevents loading the drive’s main power stage during idle periods. Thermal management relies on a Mounted heatsink blower that forces air through the aluminum fins, and this Forced cooling mode quickly removes IGBT switching losses so the unit can maintain full current during heavy machining cycles. Speed reference signals are accepted as an analogue command value, allowing conventional ±10 V setpoints from PLC motion modules to modulate spindle RPM in real time.

Environmental ratings limit operation to an ambient corridor of 5 to 45 °C, ensuring semiconductor junction temperatures stay within design margins while the controller enclosure remains free of condensation. Installation is approved up to 1000 m above sea level; beyond this, derating would be required to offset thinner air and reduced convective transfer. Communication expansion is fixed, as there is No additional interface option, so fieldbus connectivity must be handled upstream in the automation cabinet. This drive is identified as hardware revision 3, which matches spindle firmware built for analogue setpoint control and dual-encoder processing without altering existing cabinet layouts.