Product Description:

Bosch Rexroth Indramat's KDA 2.1-150-3-AQ0-U1 belongs to the KDA Spindle Drives series and is supplied as a dedicated spindle drive for CNC and machining centers. Within an automation rack, it converts a fixed DC bus into three-phase motor power while responding to an external analog speed command. By regulating spindle speed and direction, it forms the link between a motion controller and the high-speed cutting motor, ensuring stable torque delivery during milling, drilling, or grinding tasks.

The drive draws a continuous output of 150 A from a regulated DC bus rated at 300 VDC. Its internal heat sink blower is powered from a separate 115 V/50-60 Hz AC source, so thermal management is independent of the main power stage. The electronics, power transistors, and motor feedback circuits are designed to function across an ambient window of 5 to 45 °C, allowing cabinet placement on most factory floors without auxiliary conditioning. Spindle velocity is commanded through a single-ended analog reference that the control card converts into a sinusoidal output pattern. Operation remains electrically and thermally stable up to the rated current because the forced-air path removes switching and copper losses before they accumulate.

Mechanical installation can be performed at sites situated as high as 1000 m above sea level without derating, which matches typical plant elevations. The aluminum heat sink is paired with a mounted heat sink blower; when the fan starts, it pulls air laterally through the fins in a forced cooling configuration, maintaining device temperature even during long machining cycles. This second-generation hardware carries a streamlined signal board that includes drive-enable and fault-relay contacts, yet it provides no additional interface option for fieldbus expansion, simplifying wiring and reducing cabinet depth for retrofit projects.