Product Description:

The KDA 3.3-050-3-A0I-W1 is a drive from the KDA Spindle Drives series built by Bosch Rexroth Indramat. Designed for machine-tool automation, it regulates the speed and torque of high-speed spindles while exchanging command and feedback data with the numerical control system in real time. By modulating a regulated DC bus, the unit delivers balanced three-phase power to synchronous or asynchronous spindle motors so machining processes can maintain constant surface speed, repeatable acceleration, and predictable cut quality. This operating role suits spindle-driven functions such as milling, drilling, and similar metal-cutting processes in automated machining centers and transfer lines.

The power section runs from a nominal bus of 300 VDC, and its output bridge is rated for continuous conduction at 50 A, which sets the continuous electrical operating range of the power stage. Thermal energy is removed through a mounted heat sink blower that uses 220 V at 50–60 Hz, and airflow is provided by forced cooling to keep semiconductor junction temperatures within design margins during sustained spindle loading. Installation is acceptable where ambient air remains between 5 to 45 °C; operation outside this range may trigger current derating. Cooling performance data remain valid up to 1000 m above sea level, where air density still supports the intended heat removal rate.

Control integration is based on a Series 3 hardware platform that receives the speed reference as an analog voltage or current signal. For position-related tasks, an auxiliary interface provides an incremental encoder output to the machine controller, allowing motion-related pulse information to be passed upstream. No provision exists for a second encoder input, so only the primary feedback loop is processed internally during spindle operation. This arrangement supports applications in which the controller supervises spindle-related motion data without relying on a separate internal feedback channel.