Product Description:

The KDA 3.2-150-3-D00-U1 drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. Designed for CNC machines and transfer lines, the unit converts regulated DC bus energy into controllable three-phase power for high-speed spindle motors, allowing machining processes to maintain constant surface speed during cutting, drilling, or grinding. The device mounts in an Indramat supply and return module rack, where it works with position controllers to coordinate acceleration, deceleration, and torque control at the tool shaft. In machine-tool applications, this helps the spindle respond quickly to commanded speed changes while remaining stable under changing cutting loads.

Its intermediate circuit operates at 300 VDC, providing the voltage margin needed for rapid spindle acceleration. The power section can deliver a continuous output of 150 A, so it suits large spindle motors that require substantial current. Heat is removed by a mounted heat sink blower powered by 115 V/50-60 Hz single-phase service, keeping the cooling system independent of the DC bus. This arrangement moves air across the power transistors and heat sink surfaces to limit thermal buildup during sustained cutting duty. Speed references are transmitted as a digital 16-bit parallel word, allowing precise rpm commands without analog drift.

The drive uses forced cooling, so cabinet integration must allow unobstructed discharge air. Reliable operation is maintained between 5 to 45 °C, and installation is permitted up to 1000 m above sea level before derating is required. This model is Series 3 and Version 2. Internal protection reduces current outside the stated ambient range to protect the semiconductors. These operating limits apply to standard cabinet installations where airflow is not blocked and the module has adequate clearance for exhaust air.