Product Description:

The KDA 2.1-050-3-AQI-U1 is a spindle drive manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It converts the shared DC bus energy of an Indramat cabinet into three-phase output for high-speed machine-tool spindles, providing the current and velocity regulation required during drilling, milling, or grinding operations. The device belongs to the second hardware release of the series, and its control electronics interface directly with companion supply, feedback, and monitoring modules used in automated CNC axes.

The power section is designed for a DC link of 300 VDC; this voltage sets the switching window for the internal IGBT bridge and aligns with standard Indramat supply units. Continuous motor excitation is supported by a conductor path rated at 50 A, letting the drive energize sizable synchronous or induction spindles without undervoltage trips. Heat produced by switching losses is removed by a mounted heat sink blower, and airflow through the fins is sustained by forced cooling. That blower runs from a separate source of 115 V/50–60 Hz, so ventilation is maintained even when the DC link is disabled, keeping semiconductor junctions within safe limits during standby or controlled shutdown.

System integration is aided by an on-board incremental encoder output that delivers position data back to the CNC without an external splitter, while the velocity loop is driven by an analog speed command reference accepted on the front signal connector. Reliable service is specified for environments between 5 to 45 °C, and installation altitude is limited to 1000 m above sea level to avoid derating caused by reduced air density. These operating limits match typical shop-floor conditions and keep the electrical, magnetic, and mechanical tolerances within the design window for series 2 hardware.