Product Description:

The KDA 3.1-050-3-DQ0-W1 is a drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. It serves as a closed-loop power stage that feeds and regulates high-speed machining spindles in CNC systems, converting the DC link energy provided by a supply unit into a controlled three-phase output for the motor. By accepting a digital speed reference from the machine controller, the drive maintains precise spindle velocity, making it suitable for milling, drilling, and grinding equipment where consistent spindle speed is required. Its control loop lets the spindle follow programmed speed changes during startup, load shifts, and steady cutting operation.

The drive’s electrical ratings govern how it works with the common DC bus. Its continuous output capability is 50 A, enabling spindle motors that draw substantial current during acceleration and cutting load changes. The intermediate circuit requires 300 VDC, so the connected supply must hold that voltage within the expected range. Speed reference data reaches the control electronics through a 16-bit digital parallel channel, allowing fine setpoint resolution. Heat from the power semiconductors is removed through forced cooling, and the integral blower motor is supplied with 220 V AC, 50–60 Hz from a separate mains branch.

The drive operates reliably in ambient temperatures from 5 to 45 °C, and its mounted heatsink blower supports heat removal across that range. It can be installed at elevations up to 1000 m; above that height, reduced air density requires derating. The unit is in Series 3, which identifies its product generation within the KDA range. No additional interface option is included, so command and diagnostic traffic remains on the standard KDA backplane connectors, and the external wiring stays limited to the fixed module connections.