Product Description:

The KDA 2.1-050-3-AP0-U1 is a spindle drive from Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. As a closed-loop power module, it supplies and regulates torque for high-speed machine-tool spindles so that speed commands from the CNC controller are translated into precise mechanical rotation within an automated line. A second encoder socket supports spindle feedback or additional motor feedback, allowing the drive to work in closed-loop spindle applications that require accurate speed correction during operation.

In operation, the power section is energized from a DC bus of 300 VDC, and the current path is rated for up to 50 A of continuous load, so compatible inverters and protection devices must be sized accordingly. Thermal management uses a 115 V, 50/60 Hz source that drives the integrated blower mounted directly on the heat sink; this arrangement is identified in the build code as a mounted heat sink blower. Airflow across the fins dissipates switching losses and allows the drive to maintain rated current without derating. Speed reference data arrive as an analog voltage or current signal, which the control board converts into a pulse-width-modulated output for the spindle motor. The field for additional interfaces is blank, so no extra interface option is included on this version.

System designers can integrate the unit into enclosures that use forced cooling, because the blower continuously pulls ambient air between 5 to 45 °C through the heat sink and keeps internal components within safe operating limits. The drive maintains full operation at elevations up to 1000 m above sea level, permitting installation on mezzanine floors or at moderate-altitude facilities without adjustment to current or power limits. The product is Series 2, and the absence of auxiliary communication ports simplifies wiring when only basic analog command and encoder lines are required.