Product Description:

The KDA 2.1-050-3-LY0-U1 is a spindle drive manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. In a machining center or similar automation cell, this unit converts DC-link energy from the supply module into controlled three-phase output for high-speed spindle motors, allowing precise speed regulation during cutting, drilling, or grinding operations. Speed commands arrive digitally through the SERCOS interface, which supports parameter exchange with the motion controller and synchronizes spindle and axis movements within the real-time bus cycle.

The drive is powered from a DC bus of 300 VDC, so the connected supply module must maintain a stable link voltage at this level. Continuous motor demand can reach a rated phase current of 50 A, so conductors, fusing, and cooling must be sized around this value. To remove process heat, the housing uses a mounted heat sink blower, and airflow across the fins is driven by internal fans rather than cabinet ventilation. Thermal transfer is improved by forced cooling, so waste heat is removed regardless of cabinet temperature or motor load profile.

The blower runs from an auxiliary supply of 115 V, 50/60 Hz, making it independent of the DC link and ensuring airflow whenever the machine main switch is on. The permissible ambient temperature range is 5 to 45 °C, which helps protect internal components from condensation at startup and from insulation stress at elevated temperatures. Installation altitude is limited to 1000 m above sea level; beyond this point, derating is required because lower air density reduces convective cooling. Feedback versatility is expanded by a second encoder input and synchronous input, allowing the control loop to monitor motor position and an external spindle encoder without additional interface hardware.