Product Description:

The KDA 3.1-050-3-AYS-W1 is a closed-loop spindle drive manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. It converts speed commands from the machine controller into precise armature currents that govern high-speed spindle motors used in metal-cutting and forming centers. By integrating power electronics, signal processing, and dedicated cooling hardware in one housing, the unit provides a compact axis solution that simplifies cabinet wiring and maintains motor response accuracy during demanding industrial cycles.

The power stage operates from a DC bus of 300 VDC, and its continuous output capability is rated at 50 A. Thermal losses created by this current are removed by a heatsink blower that draws its own supply of 220 V/50-60 Hz, isolating cooling demand from the main DC link. The internal airflow path uses forced cooling, keeping semiconductor junction temperatures within safe limits even under sustained torque commands. Parameter adjustments and diagnostic queries are executed through an RS-232C serial interface, allowing direct connection to a local computer or plant network. Installation sites can be located up to 1000 m above sea level without derating. A mounted heatsink blower, together with its separate AC source, makes the unit independent of cabinet airflow.

Operating temperature is specified from 5 to 45 °C, a range that matches most production floors while protecting internal electrolytic capacitors and sensors from condensation or thermal drift. For applications that demand exact spindle positioning, a second encoder input and a synchronous input enable redundant feedback or master-follower phasing without external interface modules. The speed reference path is analog, so ±10 V signals from legacy or modern CNC controllers can be accepted directly, allowing the Series 3 control design to integrate into existing motion architectures without digital protocol converters.