Product Description:

The KDA 2.1-100-3-DQI-W1 is a spindle drive produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. The series 2 identifier marks its design generation and indicates compatibility with matching supply modules in the same platform. In a CNC cabinet, the unit converts the shared direct-current bus into regulated three-phase output for high-speed spindles, supporting accurate speed regulation during turning, milling, and grinding tasks. This operating role makes it suitable for machine tools that depend on stable spindle response under changing load conditions.

The drive provides a continuous output of 100 A, giving it the current capacity needed to accelerate large-diameter spindle rotors without saturation. Its power stage is supplied from a stabilized bus of 300 VDC, which helps maintain consistent torque across the working speed range. A separate blower motor operates from an auxiliary line rated at 220 V, 50/60 Hz, so cooling performance remains independent of DC bus variation. Mechanical heat removal relies on a mounted heat sink blower with forced cooling, and this airflow moves directly across the internal fins during extended cutting cycles. For velocity reference, the controller reads a 16-bit parallel digital speed command, which avoids analog offset and allows fine numerical resolution.

Reliable operation is permitted at ambient temperatures from 5 to 45 °C, which covers most enclosed machining cells without additional air conditioning. Installation heights up to 1000 m above sea level are allowed before derating is required, since lower air density reduces cooling effectiveness. To support axis coordination, the drive provides an incremental encoder output that sends position information to higher-level motion controllers. This feedback path supports spindle orientation functions such as tool change positioning and tapping cycles without requiring a separate sensor assembly.