Product Description:

The KDA 3.1-050-3-L00-W1 is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. The unit functions as a closed-loop power stage for high-speed machine-tool spindles, converting a common DC bus into controlled three-phase output, energizing its own cooling fan, and exchanging motion data with the main controller. Within an automation cell, it governs spindle speed, torque, and orientation so cutting, grinding, or drilling operations remain repeatable and synchronized. It is intended for machine platforms where coordinated spindle behavior must remain consistent with the rest of the axis system.

The drive is energized from a shared link voltage of 300 VDC, and this internal rail supplies the inverter that can continuously furnish 50 A to the motor windings. A dedicated blower mounted on the heatsink forces air across the IGBT stack, and that fan is powered by an auxiliary source rated at 220 V/50–60 Hz, separating thermal management from the main power circuit. The unit uses a mounted heatsink blower, which keeps semiconductor junctions within their operating temperature range during prolonged full-load cycles and supports stable operation in compact cabinets. Speed setpoints, status words, and diagnostic messages are exchanged over the fiber-optic SERCOS interface, giving deterministic communication and simplified daisy-chain wiring among multiple axes in the machine.

This module is Series 3. It may be installed where ambient air stays within 5 to 45 °C and at elevations up to 1000 m above sea level; operation outside these limits requires current or duty cycle reduction. The unit has no additional interface option, and the feedback connector omits a secondary encoder channel, so single-encoder spindles can be cabled without auxiliary signal lines while the cabinet layout stays compact. That arrangement suits applications that rely on one primary feedback source for closed-loop spindle control.