Product Description:

The KDA 3.2-050-3-LYI-U1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. As a digital power module, it regulates the armature current and velocity of high-speed spindle motors used in machining centers and other automated equipment. By converting a fixed DC bus into a controlled three-phase output, the unit enables precise speed and torque control for drilling, milling, and grinding tasks. Its closed-loop behavior helps the spindle remain stable during load changes, rapid acceleration, and controlled deceleration between machining steps.

The power section is intended for enclosed drive cabinets where supply matching and heat removal are important for stable spindle operation. A DC link of 300 VDC supplies the power stage, and the converter can deliver a continuous armature current of 50 A, letting medium-frame spindles run without derating. Thermal energy is removed by a mounted heat sink blower powered from 115 V/50–60 Hz, and the unit uses forced cooling to keep semiconductor junctions within limits. The permissible ambient range extends from 5 to 45 °C, so it can operate in typical shop environments. Installation is approved up to 1000 m above sea level, where cooling performance remains adequate for normal use.

Communication and feedback features support spindle control functions. Speed commands arrive via the SERCOS Interface, giving deterministic setpoint updates over a fiber-optic ring. Position verification is available through an incremental encoder output, while a second encoder input and synchronous input allow dual-loop operation for spindle orientation or tool-changer referencing. These interfaces are used on series 3, version 2 drives and simplify wiring between the spindle and the CNC controller by eliminating separate signal converters. This arrangement supports synchronized motion and reliable feedback exchange during speed changes and orientation tasks.