Product Description:

The KDA 3.1-050-3-AQ0-U1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. It functions as the inverter stage in CNC and general automation, transforming a stabilized DC link into variable-frequency, variable-voltage output that lets the control system regulate spindle speed in real time. This arrangement supports accurate surface-cutting speeds, quick acceleration, and repeatable torque delivery for milling, drilling, or grinding processes while the dedicated heat sink blower keeps the power electronics within safe junction-temperature limits.

The drive is energized from a DC link of 300 VDC, so rectifier or regeneration modules must maintain that level to keep pulse-width modulation linear. A nominal output of 50 A allows connection to mid-range induction or synchronous spindle motors without thermal derating during heavy cuts. The integral heat sink fan is powered separately at 115 V/50-60 Hz, so blower performance remains stable during transient loading. Heat is removed through forced cooling, which helps maintain semiconductor temperature even at continuous high switching frequencies. Velocity references are accepted as a ±10 V signal through an analog speed command, permitting straightforward wiring to legacy or modern motion controllers that still rely on analog loops for spindle regulation.

Operation is permitted between 5 °C to 45 °C, which covers most production spaces equipped with standard HVAC but not specialized chillers. Full electrical ratings apply up to 1000 m above sea level; at higher elevations, reduced air density lowers cooling effectiveness. The thermal path uses a mounted heat sink blower, so additional cabinet fans are unnecessary. The unit is supplied with no additional interface option, making it suitable for installations that rely on analog speed control and standard fault relays.