Product Description:

The KDA 2.1-100-3-D0S-U1 is a spindle drive built by Bosch Rexroth Indramat for the KDA Spindle Drives series. It serves as the power and regulation stage between a DC bus and high-speed machining spindles, converting command data into controlled three-phase output. Within an automation cell, this unit coordinates rapid tool rotation and torque delivery, allowing CNC controllers to maintain surface finish and throughput during drilling, milling, or grinding tasks. Because spindle demand can change quickly during cutting, the regulator adjusts output so commanded speed is maintained as tool load varies.

The drive electronics are energized from a 300 VDC supply rail, and the output section can deliver up to 100 A of continuous current to the motor windings. An auxiliary blower is powered from 115 V at 50/60 Hz and moves air across the heat sink to stabilize internal temperature. Thermal extraction uses forced cooling, which supports full current across the allowed load range. Speed reference data arrive as a 16-bit digital parallel word, giving the controller fine resolution over spindle speed changes. This Series 2 variant omits a secondary encoder channel, so feedback is limited to the primary sensor selected by the machine builder. That arrangement suits machines that rely on a single feedback source for closed-loop spindle control.

The drive can operate at ambient temperatures from 5 to 45 °C and at elevations up to 1000 m above sea level without derating. Machine integration is assisted by an RS-232C serial interface, allowing parameter upload, diagnostics, and remote adjustments from a supervisory PC. Cooling hardware includes a mounted heat sink blower fixed to the housing, so separate cabinet airflow is not required for heat removal. With the blower attached directly to the unit, heat is managed locally instead of depending on general cabinet ventilation. This helps the drive fit enclosed machine layouts where external airflow is limited.