Product Description:

The Bosch Rexroth Indramat KDA 3.3-050-3-A0S-W1 is a spindle drive from the KDA Spindle Drives series that supplies controlled three-phase power to high-speed machining spindles. The module fits into a common DC bus system and serves as the dedicated spindle axis inside automated machine tools. By linking to companion drive controllers through standardized back-plane connectors, it maintains precise velocity regulation so drilling, milling, or grinding operations stay within programmed cycle times.

The unit draws a continuous output of 50 A while operating from a DC bus of 300 VDC. Its integrated heat sink blower is powered by an auxiliary line of 220 V 50–60 Hz, so the drive can remove switching losses without depending on cabinet airflow. The cooling assembly uses a mounted heat sink blower positioned on the top of the drive housing. Command signals enter as an analog speed command, which the internal control logic converts into current-regulated output for the spindle motor. Diagnostic data or basic parameter changes can be exchanged over a serial interface (RS-232-C), giving direct access without additional network hardware. The drive operates in ambient temperatures from 5 to 45 °C, keeping the power semiconductors and control electronics within their thermal limits. A second encoder channel is not installed, so speed feedback is accepted only from the primary resolver or encoder wired to the standard input.

Hardware revision 3 of the drive uses forced cooling, allowing full-load service up to 1000 m above sea level without derating. The blower directs air through the heat sink fins to keep internal temperatures stable when cabinet ventilation space is limited. This layout suits machine tools that use compact drive enclosures and require steady spindle operation during extended production cycles.