Product Description:

The KDA 2.1-100-3-LQI-W1 spindle drive is produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed to energize and regulate high-speed machine-tool spindles, the unit converts the common DC-bus voltage of a multi-axis rack into three-phase output while exchanging speed and diagnostic data with the CNC controller. Its compact module format matches other axis cards, allowing centralized thermal management and simplified wiring in automated production lines. By integrating a dedicated heat sink blower, the drive maintains steady semiconductor temperatures during prolonged high-current cutting operations.

The power section is fed from an internal bus that sits at 300 VDC, so the device mounts directly next to other KDA family modules sharing the same supply. The inverter can deliver a continuous 100 A to the spindle motor, giving the torque needed for large-diameter tools. Speed demand is received digitally over the SERCOS interface, eliminating analog drift and simplifying parameter exchange. An incremental encoder output passes real-time rotor position to external controllers for synchronized tapping or C-axis functions. Cooling is handled by a mounted heatsink blower attached to the rear plate; the fan forces air through the fin stack and prevents hotspot formation when the drive is enclosed in a cabinet.

The cooling path uses forced cooling, and the blower motor draws power from a 220 V/50–60 Hz auxiliary source, so cabinet power distribution can follow standard shop voltages. Ambient operation is specified between 5 to 45 °C, allowing installation in typical factory settings without additional climate control. The unit can be mounted up to 1000 m above sea level before derating becomes necessary. It is version 2 within the series and supports the digital command set used for this generation.