Product Description:

The KDA 2.1-050-3-AQS-W1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It converts the fixed 300 VDC link voltage from an Indramat power supply into a three-phase output that regulates speed and torque for high-frequency machining spindles and grinding heads. Within an automation cabinet, the drive exchanges setpoints and diagnostics through an analog velocity channel and a separate serial port, allowing the motion controller to supervise speed while the drive handles current control. Because spindle applications can see rapid load changes during cutting or grinding, this arrangement helps maintain consistent torque response without requiring the controller to manage the power stage directly.

The current supplied to the motor windings is limited to 50 A, which sets the continuous current available to the connected spindle. The internal electronics are energized from a 300 VDC bus, so the cabinet power section must provide this constant DC link. A heat-sink blower mounted on the drive receives power from an auxiliary line rated at 220 V 50-60 Hz, which helps keep semiconductor temperatures within operating limits during sustained duty. Velocity references arrive as an analog signal, typically ±10 V, so the CNC or PLC can scale spindle speed with straightforward hardware. For parameter upload, fault logging, and service commands, the unit uses a serial interface (RS-232C) that connects directly to a PC. This separate communication path allows access to operating data without interrupting the main speed command signal.

Thermal management relies on a mounted heat-sink blower that pushes air across the fin pack, and the enclosure uses forced cooling, so the surrounding cabinet must provide unobstructed airflow. Reliable operation is permitted between 5 to 45 °C, which matches common ambient conditions on production floors. Installation altitude is limited to 1000 m above sea level. Above this height, reduced air density lowers cooling effectiveness and may require derating. Clear cabinet ventilation remains important because blocked airflow can raise internal temperature even when the surrounding air stays within the permitted range.