Product Description:

The KDA 2.1-100-3-DQI-U1 is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. This spindle drive conditions DC bus power and modulates three-phase output to operate high-speed machine-tool spindles with precise electronic control. By accepting digital speed commands and returning diagnostic data, it links a CNC controller to the cutting axis and supports consistent surface finish and repeatable machining cycles in automated production cells. That arrangement allows the drive to translate controller commands into stable torque and speed response during drilling, milling, and turning operations.

Internally, the drive powers its control electronics and blower from an auxiliary tap rated at 115 V at 50/60 Hz, so common single-phase service lines are adequate for the cooling supply. That auxiliary source supports low-power internal functions rather than the spindle output stage. Cooling is assisted by a mounted heat sink blower fixed directly to the finned sink, and the unit uses forced cooling to keep semiconductor temperatures below the derating point during extended high-load cuts. The inverter section is tied to a regulated link of 300 VDC and can deliver a continuous phase current of 100 A, which suits medium-power spindle motors used on milling heads or turning centers. Spindle speed is commanded through a digital 16-bit parallel interface, allowing the CNC to send exact numeric speed values without the offset and drift associated with analog references.

Position feedback distribution is supported by an additional incremental encoder output, which mirrors incoming sensor pulses so auxiliary displays or synchronized axes receive the same timing data. This mirrored signal can also be used by external counters or monitoring circuits that need the same pulse train as the main feedback device. The unit maintains full electrical and thermal ratings from 5 to 45 °C, which suits normal factory cabinet environments without special air conditioning. Installation is permitted up to 1000 m above sea level, after which altitude derating applies to the drive.