Product Description:

The KDA 2.1-100-3-AYS-U1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. As a spindle drive, it regulates torque and speed on high-precision machine tool spindles while drawing energy from a regulated DC bus. By closing the control loop with position feedback and a second encoder channel, the unit maintains commanded spindle profiles that are essential for consistent surface finishes and accurate toolpaths in automated machining cells. This operating method supports stable cutting behavior during changing spindle loads and rapid shifts in commanded speed.

A heatsink blower fed from 115 V/50-60 Hz mains pushes air across the fin stack, and the airflow path uses a mounted heatsink blower that fits directly with the cooling assembly. The DC link operates at 300 VDC, and the inverter section supplies up to 100 A of phase current during continuous spindle cuts. The amplifier relies on forced cooling to keep semiconductor temperatures within a safe operating range during changing duty cycles. A secondary encoder input and a dedicated synchronous channel allow direct phase alignment between rotor position and the digital control loops, which improves low-speed torque response and helps maintain smooth spindle rotation.

Parameter adjustment and status reporting are available through a serial interface (RS-232-C), so local setup and diagnostics can be handled without additional network hardware. The heat rejection system supports ambient operation from 5 to 45 °C, and installations up to 1000 m above sea level retain nominal performance. For motion commands, the drive accepts an analog speed command, permitting direct connection to legacy CNC controllers that use a ±10 V reference. This input arrangement allows older control platforms to work with the drive while the internal current loops manage motor response.