Product Description:

The KDA 3.2-050-3-DQS-U1 is a spindle drive module manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. The unit functions as the regulated power link between a machine controller and a three-phase spindle motor, adjusting torque and speed so machining centers can perform constant-speed cutting, tapping, or grinding under changing loads. By processing digital speed references and feeding controlled current to the motor windings, the module automates spindle motion while retaining the rapid acceleration demanded in modern CNC and transfer-line equipment. This operating role makes it suitable for spindle applications that must keep speed stable during tool engagement and other rapid load changes.

Internally, the power stage is designed for a DC bus of 300 VDC, a level matched to the supply modules found in Indramat drive cabinets. Under continuous operation, the output stage can deliver 50 A to the spindle windings, supplying the current reserve needed for sharp acceleration profiles. Heat is removed by a heatsink blower, and the drive uses forced cooling. The blower requires an auxiliary supply of 115 V, 50–60 Hz, allowing it to run whenever cabinet mains are present. Position controllers feed the module with a digital 16-bit parallel speed reference, providing fine resolution in each velocity update without analog drift.

The drive maintains rated performance in ambient temperatures from 5 to 45 °C, eliminating the need for cabinet chillers in most workshops. Altitude capability reaches 1000 m above sea level before derating is required, so standard output is retained in many facilities. Parameters and diagnostic registers are accessible through the integrated RS-232 C serial interface, which allows direct access to operating data while the module remains installed in the rack. The unit is in Series 3 and version 2, matching KDA racks that use the same bus bars and connector pinouts.