Product Description:

The KDA 2.1-150-3-API-W1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. Within a machining center or turning cell, this unit converts the controller’s torque and speed commands into regulated three-phase power for high-speed spindle motors, allowing precise cutting, drilling, or grinding cycles. As a member of the second series generation, it incorporates a dedicated heatsink blower and encoder interfaces so the spindle loop can be closed directly inside the drive.

The heatsink blower is powered from a single-phase source rated at 220 V at 50–60 Hz, ensuring airflow independent of the DC bus. Internally, the power section is supplied from a 300 VDC link that originates in the cabinet’s shared rectifier, and its phase modules are designed for a continuous output of 150 A to sustain heavy roughing passes. Ambient installation must stay between 5 to 45 °C so the semiconductor junctions remain within their intended temperature range. Operation is permitted up to 1000 m above sea level. Heat is removed by a mounted heatsink blower, and the airflow path uses forced cooling to prevent recirculation inside sealed cabinets.

An integrated incremental encoder output replicates spindle position information for downstream axes or a synchronous tool changer, while a second encoder socket allows direct spindle or auxiliary motor feedback. The set-point interface accepts an analog speed command, letting legacy CNC controllers modulate velocity with a ±10 V signal. These feedback and command paths support closed-loop spindle regulation inside the drive without requiring external interface modules. The additional encoder connection also helps the unit exchange motion signals with related machine functions while maintaining stable response during changing load conditions.