Product Description:

The KDA 3.1-100-3-LQ0-U1 is a spindle drive manufactured by Bosch Rexroth Indramat and supplied within the KDA Spindle Drives series. Designed for closed-loop regulation of high-speed machine-tool spindles, the unit converts a fixed DC link into the variable three-phase power required for precision cutting or grinding heads. By coordinating torque, velocity, and position commands with the motion controller, the drive serves as an integral part of automated production lines that rely on accurate spindle-speed profiles. This arrangement supports stable spindle control during machining processes where load conditions can change quickly.

The KDA 3.1 design is powered from a DC bus of 300 VDC, and it can deliver a continuous motor phase current of 100 A. This electrical capacity supports the spindle power range and the matching inverter size. Thermal management is handled by a mounted heat-sink blower operating with forced cooling, so internal semiconductors remain within safe limits even during high cycle rates. That blower is fed by an auxiliary source rated at 115 V/50-60 Hz, which lets the cooling circuit operate independently of the main DC link. The drive is intended for ambient temperatures from 5 to 45 degrees Celsius, helping the control electronics maintain accuracy under typical shop-floor conditions.

The drive retains full current output up to 1000 m above sea level, which supports use in elevated facilities without reducing rated performance. Velocity references arrive through the SERCOS interface, so the unit synchronizes with the control system over a fiber-optic ring without analog trimming. Because the hardware includes no additional interface option, all control and diagnostic access is handled through the base SERCOS channel. The parameters are organized to match the series 3 architecture used throughout the current KDA platform.