Product Description:

The KDA 3.2-050-3-LQD-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a dedicated power module for high-speed machining spindles, it converts the regulated DC link of a cabinet supply into controlled three-phase output, letting a CNC controller command torque and velocity directly. In industrial automation cells, this unit forms the link between a motion control system and the rotating tool, supplying current, collecting feedback, and coordinating acceleration so that cutting, drilling, or grinding operations stay within programmed cycle times.

The drive operates from a 300 VDC intermediate circuit and can deliver a continuous output of 50 A, enabling sizable electromagnetic torque on medium-frame spindle motors. Thermal management is handled by a mounted heat sink blower that forces air across the power semiconductors, and the fan is energized from an auxiliary 115 V/50-60 Hz AC source so the cooling circuit remains active even when the DC bus is de-energized. Speed reference data arrives through the SERCOS interface, while an additional channel accepts a digital position command value for synchronized spindle orientation during tool changes or tapping cycles. These electrical and communication features support continuous spindle operation and controlled orientation functions.

The drive is specified for surrounding air temperatures of 5 to 45 °C; within this range, forced airflow keeps internal junction temperatures within safe limits. Installation is permissible up to 1000 m above sea level without derating, covering most factory elevations. The numeric family indicator 3 in the type code marks the product generation, and the unit is Series Version 2 for use with later SERCOS motion controllers and updated cabinet power supplies.