Product Description:

The KDA 3.2-050-3-LY0-W1 spindle drive is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It is a Series 3, Version 2 unit that serves as the regulating amplifier for high-speed machine-tool spindles. By converting common DC-bus energy into a controlled three-phase output, the drive maintains constant torque and speed during cutting, drilling, or grinding cycles. In typical automation cabinets, it works with matching power supplies and feedback devices to close the velocity loop on asynchronous or synchronous spindle motors.

Its continuous output capability is 50 A, allowing the connected spindle motor to draw substantial armature current without derating under nominal cutting loads. The internal power section is fed from a 300 VDC bus, so the DC link must be sized correctly for stable regeneration and braking. Thermal management is handled by a mounted heat sink blower that forces air directly across the IGBT modules. This arrangement uses forced cooling to sustain full current even in enclosed cabinets. The blower itself is supplied from a dedicated 220 V/50-60 Hz single-phase tap, which separates auxiliary ventilation from the main logic supply.

Velocity references arrive over the SERCOS interface, enabling deterministic setpoint updates from the CNC controller. For precision orientation tasks, the drive includes a second encoder input and a synchronous input, letting it reconcile spindle position with external master axes. Reliable operation is permitted between 5 to 45 °C, and installation altitude can reach 1000 m above sea level before nominal ratings must be reduced. Because there is no additional interface option, wiring is limited to the standard control, encoder, and power terminals used on this model. This keeps cabinet connections straightforward and avoids unused interface points.