Product Description:

The KDA 3.2-050-3-A0D-U1 belongs to the KDA Spindle Drives series developed by Bosch Rexroth Indramat. As a spindle drive, it converts the DC-link energy of an Indramat supply module into three-phase power for spindle motors on machining centers, grinders, and similar equipment. Series index 3 and version 2 indicate the product generation used with corresponding HSF and REF interface cards inside a modular cabinet. The drive maintains constant spindle speed under changing mechanical load so that surface finish and cutting feed rates remain predictable in automated production.

This model operates from a DC intermediate circuit rated at 300 VDC and can deliver a continuous output current of 50 A to the motor windings. Internal losses are removed by a mounted heat sink blower powered from an auxiliary line of 115 V/50–60 Hz, and the airflow moves across the aluminum extrusion to keep the electronics within thermal limits under full torque. That fan is part of the drive’s forced cooling arrangement, which allows higher current density than natural convection. Position reference information can be received through a separate digital interface, while analog speed commands enter on differential ±10 V lines.

The drive can be installed in workshops where the ambient temperature stays between 5 to 45 degrees Celsius, and it maintains its rated data up to 1000 m above sea level without derating. A secondary encoder socket is not provided, so feedback is taken only from the primary spindle encoder. For motion tasks that need stepwise or dwell positioning, the unit accepts a digital position command value, while continuous speed references remain available through the analog input. These interfaces let the KDA drive operate in composite axes that share power supplies while allowing separate tuning for each spindle stage.