Product Description:

The KDA 2.1-100-3-A00-W1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Designed for Series 2 control racks, it regulates speed and torque for machine-tool spindles by converting the DC link energy available in an automation cabinet into adjustable three-phase output. Its role is to follow an analog speed command with high precision so milling, drilling, and grinding processes can maintain dimensional accuracy under changing load. The controlled output also helps the spindle respond smoothly as cutting conditions shift during operation.

The drive draws a continuous phase current of 100 A, giving it the capacity to energize large-frame spindle motors during heavy material removal and extended duty. A DC bus of 300 VDC feeds the power stage, while the heatsink blower is powered separately from a 220 V/50-60 Hz single-phase source so the cooling supply remains separate from the main bus. Thermal exchange occurs through a mounted heatsink blower with forced cooling, which keeps the power section within its operating temperature range during long production cycles. This cooling method is suited to cabinet installations where the spindle drive must run for long periods without interruption.

Environmental limits permit operation between 5 to 45 °C, supporting stable performance in typical industrial indoor conditions. Installation is allowed up to 1000 m above sea level; above that height, derating is required because lower air density reduces heat removal around the heatsink. The type designation indicates no additional interface option, so the unit does not include extra fieldbus or serial channels. The velocity loop uses a single analog command path, and the drive does not provide a second encoder input, so any added feedback channel must be handled by other system components.