Product Description:

The KDA 3.2-100-3-A0S-U1 is a drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. Its task in industrial automation is to convert DC bus energy into controlled three-phase output that accelerates and regulates motorized spindles on CNC machining centers. By coordinating torque demand with real-time feedback from the numerical controller, the unit supports precise cutting speeds and repeatable manufacturing tolerances. This operating role suits machine tools that need smooth spindle response during acceleration, speed changes, and steady cutting conditions. It is intended for spindle applications where the drive must maintain stable rotation as cutting load changes throughout the machining cycle.

Electrical ratings show how the drive integrates with a common DC bus. It is energized by a nominal bus of 300 VDC, and its power section can deliver up to 100 A of continuous output current to the spindle motor. Speed reference is accepted as an analog voltage, so the controller can follow proportional commands from the CNC without extra signal conversion. Parameter access and diagnostic data are exchanged through a standard serial connection, while no additional encoder input is provided, which simplifies feedback wiring. Thermal energy from the IGBT stack is removed by a mounted heat sink blower supplied from an auxiliary line of 115 V 50–60 Hz; the blower uses forced cooling to keep internal components within their operating range.

Environmental limits indicate where the module can be mounted. Reliable operation is specified between 5 to 45 °C ambient temperature, and functional stability is maintained up to 1000 m above sea level without output derating. Inside the cabinet, the heat sink blower supports airflow across the mounted surfaces, so separate panel ventilation may not be necessary in suitable enclosures. Control integration uses a serial RS-232C interface for setup access and diagnostic exchange. The drive is Series 3 and Version 2.