Product Description:

Bosch Rexroth Indramat manufactures the KDA 3.2-100-3-D00-U1 spindle drive as part of the KDA Spindle Drives series. The unit converts regulated DC bus energy into controlled three-phase outputs for motorized spindles that perform cutting, drilling, or grinding tasks in automated machine tools. In CNC equipment, it regulates spindle current so commanded speed changes can be followed with stable torque delivery during machining cycles. Series 3 and version 2 indicate the internal control platform used by the drive and align it with compatible Indramat supply modules and diagnostic functions used in the same system.

The power stage is supplied from a DC link rated at 300 VDC, and it can deliver up to 100 A of continuous armature current to the spindle motor. This current capacity suits spindle applications that need sustained torque during extended material removal or repeated start-stop duty. Thermal loads are removed by a mounted heat sink blower that pulls ambient air across the rear extrusion, and this blower is powered from an auxiliary 115 V, 50/60 Hz single-phase source. The drive uses forced cooling, so the cabinet must provide a clear discharge path and enough surrounding space for stable airflow.

Command data enter through a parallel bus that accepts a 16-bit parallel digital speed word, allowing precise setpoint resolution from standstill to maximum spindle speed. This control method supports direct speed command transfer from the machine controller without requiring an added communication card. The electronics are approved for operation from 5 to 45 °C, and performance remains unchanged up to 1000 m above sea level when the cooling air is clean and unrestricted. The drive has no additional interface option, and it also omits a second-encoder input, so any dual-loop expansion must be handled by the upstream controller.