Product Description:

The KDA 3.1-150-3-DYD-U1 is a spindle drive module produced by Bosch Rexroth Indramat and part of the KDA Spindle Drives series. It converts regulated DC-link energy into three-phase output for high-speed motorized spindles used in CNC machining centers and turning machines. Internal logic accepts digital reference data from the machine controller, while a mounted heat sink blower removes switching losses produced under heavy load. This arrangement supports stable spindle control during cutting, drilling, and other speed-sensitive machining operations. In an automation cell, the drive maintains commanded spindle speed and torque so machining accuracy stays within tolerance.

The power section draws 300 VDC from the common supply bus and can deliver a continuous output of 150 A, giving it enough margin to accelerate large spindle motors without derating. Thermal energy is removed through a blower powered by an auxiliary source rated at 115 V/50–60 Hz, which keeps airflow constant during regenerative events. The drive uses forced cooling, so heat sink temperature is controlled by active air movement rather than passive convection. Motion commands arrive as a 16-bit digital parallel speed word, allowing the numerical control to set precise rotational velocity in one bus cycle.

The drive may be mounted at elevations up to 1000 m above sea level. Reliable operation is permitted only between 5 to 45 °C, so the panel must stay within that ambient range during use. For multi-axis machines, the module provides a second encoder input and a synchronous input, enabling phase-aligned feedback from tandem spindles or external master encoders. A dedicated channel for the digital position command value lets the controller transmit incremental moves directly for tapping, orient, or rigid tool-change sequences without analog conversion.