Product Description:

Bosch Rexroth Indramat manufactures the KDA 2.1-050-3-D0I-U1 spindle drive as part of the KDA Spindle Drives series. Designed for main-spindle regulation, the unit converts fixed DC bus energy into variable three-phase output so CNC and machining centers can maintain commanded speed and torque profiles. By integrating into modular drive racks, this product links the machine control’s velocity loop with the motor field, enabling precise spindle positioning and rapid acceleration required in automated metal-cutting and forming tasks.

The drive draws its logic and power from a DC bus of 300 VDC, and its power semiconductors are dimensioned for a continuous output of 50 A, allowing medium-frame induction spindles to sustain high cutting loads without derating. A dedicated blower input rated at 115 V/50-60 Hz supplies the fan mounted on the heat sink; together with the predefined forced cooling mode, this arrangement removes switching and motor losses before they raise the module temperature. Safe operation is supported within an ambient range of 5 to 45 °C, so cabinet climate control can follow common shop-floor guidelines without special chillers.

Installation altitude is limited to 1000 m above sea level, which prevents reduced air density from compromising the thermal path of the heat sink-mounted blower. For feedback distribution, the front panel provides an incremental encoder output, allowing downstream axes or the CNC to replicate spindle position without extra splitters, while the lack of a second encoder input simplifies wiring. Speed demand reaches the drive over a digital 16-bit parallel interface, giving the controller immediate resolution steps rather than relying on analog conversion. This helps maintain velocity accuracy and signal integrity during high-speed machining.