Product Description:

The KDA 2.1-100-3-AY0-U1 belongs to the KDA Spindle Drives series from Bosch Rexroth Indramat. As a spindle drive, it supplies regulated three-phase power to high-speed machine tool spindles so that cutting speed and torque stay consistent during machining, tapping, or grinding cycles. The unit sits between the DC link of a larger drive cabinet and the motor, translating speed references from a CNC controller into precise current and voltage outputs needed for dynamic spindle control.

The drive is powered from a DC bus of 300 VDC, giving the internal inverter the headroom needed for rapid acceleration and braking of low-impedance spindle motors. It can deliver a continuous phase current of 100 A, allowing the spindle to generate substantial cutting torque without thermal derating. A dedicated heat sink blower operates from an auxiliary supply of 115 V/50–60 Hz; this blower is mounted on the rear of the drive and directs airflow across the power semiconductors. The cooling assembly is a mounted heat sink blower, and airflow is created through forced cooling, preventing junction temperatures from exceeding safe operating limits during prolonged high-load duty cycles.

Operation is permitted at ambient temperatures from 5 to 45 °C, so the unit can remain in service on most factory floors without supplemental enclosure conditioning. Installation is specified up to 1000 m above sea level; beyond this altitude, current capacity should be derated because lower air density reduces heat removal around the heat sink. For feedback tasks, a second encoder input and a synchronous input are provided, enabling spindle orientation or dual-loop setups, while the lack of an additional interface option keeps the wiring layout uncomplicated. Speed reference signals are accepted as an analog voltage, allowing straightforward integration with conventional CNC or PLC analog output cards.