Product Description:

The KDA 3.2-100-3-APS-U1 is a spindle drive module produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed for machine-tool environments, the unit converts a regulated direct-current bus into controlled three-phase output that runs high-speed motorized spindles. By integrating the drive, heatsink blower, and control electronics in a single chassis, it simplifies cabinet layouts and provides the dynamic torque and speed regulation required in automated metal-cutting centers and similar equipment.

Energized by a DC bus of 300 VDC, the drive can deliver a continuous motor phase current of 100 A, allowing rapid acceleration of large spindle inertias. Its heatsink blower is supplied from a single-phase 115 V/50-60 Hz auxiliary line, so the cooling fan remains active even when the main DC link is disabled. Thermal conditions are managed through a mounted heatsink that operates under forced cooling; with this arrangement the internal power semiconductors remain within tolerance across an ambient range of 5 to 45 °C. Correct operation is maintained up to 1000 m above sea level without output derating, meeting typical shop-floor elevation requirements.

Control integration is handled through a serial interface (RS 232 C) that permits parameter loading and diagnostic queries from an external CNC or PLC. The drive responds to a analogue speed command, converting ±10 V references into precise spindle velocity, and it includes a second encoder input so either spindle-mounted sensors or an auxiliary motor encoder can feed back position and speed. These communication and feedback provisions shorten commissioning time and allow tight synchronization between multiple spindles or between the spindle and linear axes during tapping, contour milling, or thread cutting.