Product Description:

The KDA 3.2-050-3-A0S-W1-220V is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Installed in a machining center electrical cabinet, this drive modulates spindle power and speed so that the cutting process follows programmed feed rates and surface finish requirements. The device accepts speed setpoints from a higher-level controller and delivers regulated armature current to the spindle motor, supporting repeatable performance in continuous or cyclic industrial automation tasks. In machine tools, that control helps maintain stable cutting conditions during drilling, milling, and similar spindle-driven operations.

The power stage is supplied from a regulated bus at 300 VDC, and its output channel can deliver a continuous spindle current of 50 A. Thermal energy generated by the IGBTs is removed by a mounted heatsink blower that runs from an auxiliary line rated at 220 V/50-60 Hz. Because cooling airflow is produced internally, the unit uses forced cooling, which helps keep semiconductor temperatures within safe operating limits during long production runs. Speed commands are received as an analog voltage, and a digital processor converts them into PWM gate signals so the spindle accelerates and decelerates according to the programmed motion profile without overshoot. This arrangement supports steady spindle behavior when the load changes during machining.

Environmental limits allow operation between 5 to 45 °C, and full performance is maintained up to 1000 m above sea level without derating. For diagnostics or parameter transfer, the front panel provides a serial interface (RS 232 C). The velocity reference remains strictly analog, matching earlier Indramat CNC architectures that rely on ±10 V signals. The unit is Series 3 and uses a Version 2 control board, and no additional encoder channel is included, so secondary feedback must be routed to the machine controller instead of the drive. This layout suits older control systems that separate spindle regulation from external feedback processing.