Product Description:

The KDA 2.1-050-3-AYD-W1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. As a spindle drive, it converts DC-link energy from a multi-axis system into three-phase power for high-speed machine tool spindles, allowing precise speed regulation during cutting, drilling, or grinding cycles. The unit uses a mounted heat sink blower on its housing so thermal loads from continuous spindle acceleration are removed without external ductwork, keeping the electronics within their permitted operating window.

This drive works from a DC bus of 300 VDC; this is the nominal internal supply that the inverter stage expects from the shared power supply module. Under that voltage, the converter can deliver a continuous output of 50 A, which is the maximum RMS phase current available to the spindle motor windings. The heat sink fan is powered separately at 220 V 50-60 Hz, isolating the blower from the DC link and ensuring airflow even when the drive is disabled. Thermal management uses forced cooling through the dedicated blower, while the ambient operating range of 5 to 45 °C indicates the temperature window in which full current is available without derating. This arrangement helps keep the IGBTs and control boards within safe operating temperatures during continuous machining cycles.

The control side features a digital position command value interface for step-controlled spindle orientation, and an analog speed command value channel so velocity can be set by a ±10 V reference from the CNC. A second encoder input and synchronous input accepts resolver or TTL feedback from an auxiliary measuring system, enabling spindle-synchronized tapping or C-axis positioning. Installation is permitted up to 1000 m above sea level, and the unit is identified as series 2 within the product line.