Product Description:

The KDA 3.2-100-3-L0D-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It functions as a closed-loop power module that regulates motor torque and speed on machine-tool spindles, translating numerical controller commands into calibrated three-phase output. In automated machining cells, the unit provides the high-current switching stage required for rapid acceleration, controlled deceleration, and constant surface-speed machining. It is a Series 3, Version 2 unit.

The internal DC bus accepts 300 VDC, establishing the intermediate circuit from which three-phase spindle power is synthesized. Within those limits, the drive can deliver a continuous armature current of 100 A, so the connected motor must support that level of copper loss and thermal loading. Heat produced by the switching elements is removed through a mounted heatsink blower, and cooling is supported by the specified forced cooling method. The blower is supplied with 220 V at 50/60 Hz, allowing the cooling circuit to operate even before the DC bus is energized. Speed reference data reaches the controller through the SERCOS interface, which provides deterministic fiber-optic communication for velocity loops. Because this variant omits a second encoder input, feedback for spindle orientation is expected only on the primary channel.

The drive is intended for operation in ambient temperatures from 5 °C to 45 °C. Cabinet ventilation must keep inlet air within that range during continuous machining. Installation altitude is limited to 1000 m above sea level so the heatsink blower can maintain sufficient airflow for rated dissipation. Position synchronization commands are transmitted as a digital position command value signal, enabling precise spindle indexing for tool changers and C-axis positioning without analog drift.