Product Description:

The KDA 2.1-150-3-D0S-W1 is a spindle drive produced by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. As a closed-loop power module, it regulates the speed and torque of high-frequency motorized spindles used in numerically controlled machine tools. The device receives axis commands from an Indramat controller, modulates current in real time, and returns diagnostic data, so it serves as the central energy interface between the motion controller and the mechanical cutting spindle. It is intended for spindle applications that require stable speed control and fast response during machining.

The internal power section is designed for a continuous output of 150 A, allowing it to drive large-diameter spindles without current derating under nominal load. A regulated link voltage of 300 VDC feeds the inverter stage, so several drives can share a common DC bus in the same cabinet. Thermal energy is removed through forced cooling, and the housing carries a mounted heat-sink blower that directs air across the fin array. This blower is powered from a dedicated 220 V / 50–60 Hz AC supply, which keeps cooling available during standby and separates fan power from the DC link. Velocity reference data arrive as a digital 16-bit parallel word, allowing fine resolution of commanded spindle speed inside the drive logic.

The drive operates in ambient temperatures from 5 to 45 °C, which suits enclosed machine cabinets with controlled airflow. Reliable function is maintained up to 1000 m above sea level without additional derating, so the unit can be installed in standard industrial locations within that altitude range. A serial interface (RS-232C) provides parameter access and status reporting to supervisory controls, and no second encoder channel is fitted, so position feedback remains dedicated to the primary spindle sensor. This layout keeps command, monitoring, and feedback tasks separated within the spindle control system.