Product Description:

The KDA 3.2-050-3-AQI-U1 is a spindle drive produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It converts the regulated DC link of an Indramat supply module into three-phase power so a motorized spindle can accelerate, brake, and hold speed under closed-loop control during machining or grinding operations. This arrangement supports stable spindle operation when cutting conditions change and the load on the motor varies throughout the cycle.

This unit delivers a continuous output of 50 A, giving it the current capacity needed for high torque at low spindle speeds and short overload periods during tool engagement. A DC link of 300 VDC connects the drive to a shared supply, which reduces the need for separate power feeds in multi-axis cabinets. Thermal management uses forced cooling through a mounted heat sink blower. The blower intake motor operates from a separate 115 V/50–60 Hz source, helping keep semiconductor junction temperatures stable even when cabinet air is stagnant. This cooling method supports continuous operation in enclosed installations where passive airflow would not be sufficient.

Installation is permitted up to 1000 m above sea level, where reduced air density still allows the cooling system to operate properly. Ambient temperature must remain between 5 to 45 °C so the heat sink can dissipate heat effectively during normal operation. For speed feedback, an auxiliary channel provides an incremental encoder output, allowing the CNC or PLC to read actual spindle velocity without an additional converter. Command references are accepted as an analog voltage, so legacy motion controllers can modulate the setpoint smoothly while the standard KDA bus handles status and diagnostic communication. The unit is a Series 3, Version 2 drive.