Product Description:

Bosch Rexroth Indramat builds the KDA 3.1-050-3-A00-W1 for high-speed machining centers that require precise spindle regulation. The unit belongs to the KDA Spindle Drives series, which interfaces directly with Indramat drive controllers to modulate motor torque and velocity in real time. By converting a regulated DC link into three-phase output, it supplies controllable power to synchronous or induction spindles and keeps cutting speeds stable across varying tool loads.

The drive’s power section is rated for a continuous output of 50 A, allowing it to handle large acceleration currents without derating during sustained duty cycles. Its DC bus is maintained at 300 VDC, a level compatible with Indramat supply modules in multi-axis cabinets. Internal cooling relies on a blower that is powered from an external 220 V AC line, and that blower tolerates mains frequencies of 50–60 Hz, so it functions in international installations without rewiring. Because the fan is mounted directly on the rear heat sink, this heat sink-mounted blower steadily moves air across the IGBT modules and recovery diodes, keeping semiconductor junction temperatures below their design limits. The electronics rack therefore stays free of additional ducting, and the drive can be placed adjacent to other heat-sensitive components.

Thermal management is reinforced by forced cooling, permitting operation in ambient ranges from 5 to 45 °C without supplemental chillers. The drive may be installed up to 1000 m above sea level before altitude derating rules apply. Closed-loop positioning feedback is available through the primary encoder channel only, as there is no additional encoder input and no auxiliary interface card option. Speed reference data enters the control board as an analog speed command, simplifying integration with legacy CNC systems that already output a calibrated ±10 V spindle reference.