Product Description:

The KDA 3.1-050-3-D0S-W1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. It is used as a spindle drive, converting DC bus power into controlled three-phase current for high-speed machine-tool spindles in milling, grinding, and drilling centers. When paired with Indramat supply modules, the unit closes the velocity loop for the spindle motor and assists the CNC in executing precise speed profiles during acceleration, constant-speed cutting, and deceleration. This arrangement supports stable spindle regulation when cutting loads change and when the machine transitions quickly between commanded speeds.

The power stage delivers a continuous output of 50 A while drawing its DC-link energy from a 300 VDC bus. Thermal management is handled by a mounted heat sink blower that receives its own single-phase feed of 220 V 50/60 Hz, and the unit uses forced cooling to sustain rated current without derating. The drive accepts a spindle speed command through a 16-bit digital parallel input word, allowing the controller to assign exact RPM values without analog drift. Separate blower power keeps the cooling circuit independent from the main DC bus supply. Internal logic monitors the DC bus so that overcurrent or undervoltage events trigger rapid shutdown, protecting both the power electronics and the attached motor.

Continuous operation is permitted at ambient temperatures from 5 to 45 °C and at elevations up to 1000 m above sea level. A built-in additional interface provides RS-232-C serial communication for parameter loading and diagnostic retrieval. The design omits a secondary encoder input, so spindle feedback is expected only through the primary channel. The unit is in series 3 and uses the same mechanical footprint as earlier KDA models in the same drive platform.