Product Description:

The KDA 3.1-050-3-LP0-W1 is a spindle drive produced by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. Designed to supply regulated power to high-speed machining spindles, the unit converts a fixed DC bus into a variable three-phase output so that CNC controllers can command acceleration, deceleration, and holding torque with precision. In automated production lines, the drive forms the link between motion control hardware and the mechanical spindle, enabling speed profiles that match cutting tools and material properties. This arrangement helps the spindle respond smoothly to changing cutting loads during drilling, milling, and turning operations.

The drive draws its logic and power from a DC bus rated at 300 VDC, which supplies the working voltage for the internal inverter stage. When continuous spindle load is present, the power section can deliver a steady phase current of 50 A, allowing medium-frame motors to reach nominal torque. Thermal energy is removed by a mounted heat sink blower, and airflow is kept constant by the blower’s own AC feed of 220 V 50-60 Hz. With forced cooling, the unit can maintain rated current when it is installed in sealed electrical cabinets where natural convection is restricted. This cooling method supports stable operation during long machining cycles in enclosed control cabinets.

The drive is approved for ambient temperatures between 5 to 45 °C and for mounting sites up to 1000 m above sea level, so floor-level machine tools can operate without derating. Speed references arrive through the standardized SERCOS interface, which transfers digital setpoints directly from the controller to the power electronics. A second encoder input lets the drive evaluate spindle feedback or an auxiliary motor encoder without external modules. Digital command transfer helps reduce noise sensitivity in electrically busy machine cabinets, and the additional feedback channel supports applications that need more than one motion-related signal source.