Product Description:

The KDA 3.2-100-3-AY0-U1 is a spindle drive manufactured by Bosch Rexroth Indramat within the KDA Spindle Drives series. The 3.2 designation indicates Series 3 and Version 2 of this drive. During operation, the unit converts a DC intermediate circuit into controlled three-phase output so a numerical control system can match spindle speed to cutting conditions in drilling, milling, or grinding applications. This type of drive is used where steady spindle regulation is needed during changing load conditions and varying cutting speeds.

Its electrical backbone is a 300 VDC link bus from the central supply. From this bus, the drive can source up to 100 A of motor current, allowing quick acceleration without torque derating. Heat produced by the switching elements is removed through a mounted heat sink blower fixed to the rear plate. Cooling is forced, so continuous ventilation is required whenever the inverter is active. The blower receives power from a dedicated 115 V/50–60 Hz feed, which keeps the cooling circuit independent of the DC link and removes the need for an internal step-down converter. That arrangement helps the power stage maintain a stable temperature during sustained high-speed machining.

Full performance is maintained in ambient temperatures from 5 to 45 °C and at elevations up to 1000 m above sea level. Feedback flexibility is increased by a second encoder input and synchronous input, allowing the primary spindle signal to be correlated with an auxiliary encoder during orientation or tapping cycles. The auxiliary feedback path is useful when spindle position must stay synchronized with machine motion or tooling events. Speed reference enters through an analog command channel, while additional digital interface functions must be handled externally because no extra interface option is installed.