Product Description:

The KDA 3.1-100-3-AQ0-U1 is a spindle drive manufactured by Bosch Rexroth Indramat and assigned to the KDA Spindle Drives series. As a spindle-oriented controller, it converts DC bus energy from the machine supply module into regulated three-phase power for high-speed machining motors. This supports closed-loop spindle speed control and fast torque response in CNC systems used for milling, drilling, and similar machining tasks. It is intended for spindle applications that require stable speed regulation during cutting, acceleration, and load changes.

The output stage is rated for 100 A of continuous current, and the unit operates from a regulated bus of 300 VDC. Heat from the power electronics is removed by a mounted heat sink blower, and that fan is supplied from an auxiliary line of 115 V/50–60 Hz. Air moves through the fins by forced cooling, which helps keep internal component temperatures within the normal operating range during sustained spindle duty. Because spindle loads can change quickly as a tool enters or leaves material, the drive regulates motor current continuously to keep commanded speed more stable under varying mechanical demand. The unit is part of design series 3, and its analog current loop responds directly to velocity commands from the motion controller.

The permitted ambient temperature range is 5 to 45 degrees Celsius, and installation is allowed up to 1000 m above sea level without output derating. Speed references are accepted as an analog voltage or current signal, which supports machines that use proportional command hardware. The hardware comes with no additional interface option, so wiring is limited to the required power, feedback, and speed-reference connections. That arrangement is useful in retrofit installations where the machine controller already provides a conventional reference output and does not depend on fieldbus expansion hardware.