Product Description:

The KDA 2.1-100-3-AY0-W1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It operates as a closed-loop power stage that supplies regulated current to high-speed machining and grinding spindles. By converting DC-link energy from the cabinet supply into a controlled three-phase output, it follows velocity commands from the CNC controller and supports stable spindle operation during demanding motion profiles. It is intended for applications that require precise torque delivery and repeatable speed control as spindle load changes during cutting or finishing.

Internally, the drive is powered from a 300 VDC bus, and its output stage is rated for a continuous line current of 100 A, which allows direct use with medium-frame induction or synchronous spindle motors. Thermal management is handled by a mounted heat sink blower. This blower operates from an auxiliary supply of 220 V/50–60 Hz and pushes air across the cooling fins to control transistor temperature. Because airflow is directed through the heat sink rather than the control electronics, the unit uses forced cooling and can maintain thermal performance when cabinet air movement is limited. This cooling arrangement supports continuous operation under sustained spindle load and helps limit thermal drift in the power section.

The drive operates in ambient temperatures from 5 to 45 °C and can be installed at elevations up to 1000 m above sea level without current reduction. Command signals are handled as an analog speed reference. A dedicated interface provides a second encoder input and a synchronous input for master-slave spindle coordination. That arrangement supports coordinated operation in multi-axis machining systems where spindle synchronization must follow an external reference. The design uses series 2 control logic and does not include additional communication ports, so integration relies on the standard voltage command channel and encoder feedback.