Product Description:

The KDA 3.1-100-3-LQ0-W1 is a spindle drive built by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a drive module, it converts regulated DC-bus energy into controlled three-phase power for high-speed spindle motors used in milling, drilling, and grinding equipment. Within an automated line, the unit sits between the motion controller and the electromechanical load, delivering torque commands and speed feedback for precise material removal. This arrangement helps the spindle respond quickly to commanded speed changes while maintaining stable rotation during cutting.

The power circuit is designed for a continuous output of 100 A, allowing the drive to supply large spindle motors without exceeding thermal limits. That current is drawn from an internal DC link maintained at 300 VDC, so upstream converters must provide a stable 300 V supply. Heat produced by IGBT switching and transformer losses is removed by a mounted heat sink blower, and airflow across the fins is increased by forced cooling instead of natural convection. Reliable operation is specified for an ambient range of 5 to 45 °C, which matches typical shop-floor enclosures and avoids derating inside temperature-controlled cabinets. The identification suffix 3 indicates the internal design revision for this series.

Auxiliary power for the heat sink fan comes from a dedicated 220 V at 50/60 Hz input, so the blower can continue operating even when the main DC link is discharged. Installation sites can be located up to 1000 m above sea level without changing current limits, which helps preserve predictable cooling performance at moderate altitude. Velocity references are delivered over the SERCOS interface, giving the controller deterministic fiber-optic communication. The unit has no additional interface option, so all control and diagnostic traffic uses the existing SERCOS channel.