Product Description:

The KDA 3.1-050-3-DQD-U1 belongs to the KDA Spindle Drives series produced by Bosch Rexroth Indramat. As a spindle drive, it converts regulated DC power into three-phase output for high-speed machine tool spindles, allowing precise velocity and torque control inside CNC machining centers and similar automation cells. It is intended for applications that require stable spindle regulation during cutting, drilling, and other continuous machining processes.

This unit operates from a DC link of 300 VDC; the bus voltage supplies the inverter bridge that generates the three-phase motor waveform. A rated output of 50 A is the continuous current the drive can deliver without derating, matching medium-power spindle motors commonly used on milling heads. The heatsink blower is powered from an auxiliary line of 115 V 50/60 Hz, so the installation must provide that single-phase source even when the main system bus is present. Thermal management is handled by forced cooling, with air drawn across the external fins to remove losses from the IGBTs and rectifier stack. Reliable operation is permitted within an ambient range of 5 to 45 °C, so the surrounding air must remain within that window during use.

Installation is permitted at elevations up to 1000 m above sea level without adjustment, which covers most plant locations. The blower is factory-mounted as a mounted heatsink blower, so no external ducting is required for standard operation. Velocity data reach the control electronics through a digital 16-bit parallel speed command channel, giving fine resolution for surface-finish control and drilling programs. When absolute position feedback from the CNC is needed, a separate digital position command interface is available so contouring axes can synchronize spindle angle with tool paths during tapping or thread-milling cycles.