Product Description:

The KDA 3.1-050-3-L0D-W1 is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It functions as a closed-loop power module that links a machine-tool controller to the stator windings of a machining spindle, converting common DC-bus energy into a three-phase output that follows velocity and position commands. By regulating current and monitoring feedback, the unit maintains torque and acceleration during drilling, milling, and grinding processes. This operating role makes it suitable for spindle applications that need stable speed control during changing cutting loads.

The continuous output reaches 50 A, supplying adequate magnetizing current for medium-power spindles without saturation. The converter is tied to a shared bus at 300 VDC, so upstream rectifiers or regenerative supplies must deliver that level to sustain rated power. A dedicated heat sink fan is energized from 220 V at 50-60 Hz, isolating its cooling demand from the DC link and allowing thermal management to remain separate from the main power path. Heat moves through a mounted heat sink blower that sits outside the cabinet wall, while forced cooling keeps semiconductor junctions below permissible limits during prolonged high-speed cutting. This arrangement helps the drive maintain stable operation during extended spindle duty cycles.

The unit operates between 5 to 45 °C, allowing placement in temperature-controlled workshops without additional conditioning. Elevation is limited to 1000 m above sea level, ensuring that air density remains high enough for the blower to remove heat effectively. Motion commands arrive through the SERCOS interface, while path control refinement can be issued on a separate digital position command value channel when higher accuracy is needed. Because no second encoder input is provided, coupling feedback must be routed through the main SERCOS fiber, which keeps wiring straightforward and reduces the number of separate feedback connections. This layout supports clean cabinet routing where compact spindle-control hardware is required.