Product Description:

The KDA 3.2-100-3-AQ0-U1 is a spindle drive manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. As a member of series 3, version 2, it supplies regulated three-phase power and feedback processing to machine-tool spindle motors, converting the motion commands issued by the parent numerical control into precise shaft rotation. Within an automation cell, it functions as the dedicated power stage, linking a 300 VDC bus to the motor while its integral heat sink blower removes the switching losses that build up during continuous cutting or grinding.

The power channel of the drive is sized for a continuous output of 100 A, allowing it to energize medium-frame spindle motors without derating. A regulated link voltage of 300 VDC is required at the DC terminals, and this is normally furnished by a supply module that shares the same cabinet. Thermal management relies on a blower that is fed with 115 V at 50/60 Hz, so the cabinet must provide a single-phase branch for the fan circuit. The blower is fixed directly to the rear panel, forming a mounted heat sink blower assembly that forces air across the extrusion fins and maintains semiconductor junction temperature within nominal limits.

Environmental limits support an ambient range of 5 to 45 °C, and operation is permissible up to 1000 m above sea level before current derating is necessary. The airflow path follows a forced cooling scheme, so reliable ventilation must be maintained even when the cabinet door is closed. Command inputs are accepted as an analog speed command, which permits direct velocity references from older CNC controllers without a digital interface. This operating method matches the designation of no additional interface option and supports use with control systems that provide a conventional speed reference.