Product Description:

The KDA 3.2-050-3-DQS-W1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Within this family, it is identified as Series 3, Version 2, and it supplies controlled three-phase power to high-speed machine-tool spindles used in automated milling, drilling, and grinding centers. By converting regulated DC bus energy into variable-frequency output, the unit lets a CNC controller adjust spindle speed precisely, helping maintain tight process tolerances and consistent surface finishes. The drive is suited to machine tools where spindle speed must remain steady through changing cutting conditions. Its controlled output helps the spindle maintain the commanded speed as tools enter or leave the workpiece.

Electrically, the drive draws blower power from a 220 V 50–60 Hz AC source that energizes its internal cooling fan. That fan is a heatsink-mounted blower, and together with the drive’s forced cooling mode it keeps semiconductor temperatures within safe limits during continuous duty. The main power stage is supplied from a rectified bus of 300 V DC, and it can deliver a rated output current of 50 A to the connected spindle motor. Directed airflow across the heatsink reduces thermal stress on the power devices during long machining runs. This cooling arrangement supports stable output when the spindle is held at speed for extended production cycles.

The drive operates in ambient temperatures from 5 to 45 °C and at installation elevations up to 1000 m above sea level without derating. Speed references are accepted through a 16-bit digital parallel command word that the drive converts into precise voltage-frequency patterns. Diagnostic and parameter data can be exchanged over an RS-232C serial link. The parallel interface supports high-resolution speed commands from the control system. The serial link provides a direct path for status access and drive adjustments, while keeping command and service communication separate.