Product Description:

The KDA 2.1-100-3-LQS-W1 is a spindle drive manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a dedicated axis controller, it converts regulated DC bus energy into three-phase output that powers high-speed machining spindles and coordinates with CNC systems in automated cells. By combining power electronics, cooling hardware, and digital communication in a single housing, the unit simplifies cabinet layout and supports precise spindle acceleration, deceleration, and steady-state speed control in production lines and metal-cutting centers.

The drive operates from a DC bus of 300 VDC, giving its power section the headroom required for rapid torque transients. A continuous output rating of 100 A lets the module energize large-frame induction or synchronous spindle motors without current derating during heavy cuts. The heat sink blower is powered by an auxiliary supply of 220 V at 50/60 Hz, so the fan can remain active even when the DC link is de-energized. Thermal management relies on forced cooling, and air is pulled across the mounted heat sink to keep semiconductor junction temperatures within safe limits during peak demand. Installation is permitted up to 1000 m above sea level, ensuring full performance in most factory locations before additional derating is needed.

The permitted ambient temperature range of 5 to 45 °C matches typical shop-floor conditions, allowing internal airflow paths to remain effective while avoiding condensation. Parameter access and diagnostics are available through the built-in serial interface (RS-232C). A mounted heat sink blower directs airflow away from surrounding components to help minimize cabinet hot spots. For real-time speed setpoints, a fiber link using the SERCOS interface carries cyclic commands and feedback between the spindle drive and the motion controller without analog drift.