Product Description:

The KDA 3.1-050-3-LYS-W1 spindle drive is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. Classified as a dedicated spindle drive, it mounts in the power cabinet and links to a 300 V DC bus shared with other axis modules. Within a machining center or grinding line, it interprets speed references from the motion controller and modulates motor current, enabling accurate acceleration, deceleration, and holding torque for high-frequency spindle motors. The unit is intended for spindle applications that require stable speed control and repeatable torque response during continuous production.

Its power section operates on a DC supply of 300 VDC, and the current stage can continuously deliver up to 50 A to the connected spindle motor. Thermal energy is removed by a mounted heat-sink blower fed from an auxiliary source rated at 220 V at 50–60 Hz. Because the fan pushes air directly across the fins, the module uses forced cooling. Proper airflow lets the unit operate throughout an ambient range of 5 to 45 °C. A dedicated second encoder input and a synchronous input are provided so the control loop can process additional feedback from spindle-mounted or workpiece-mounted sensors, improving position correlation at high speed. These added inputs support synchronized motion where spindle position must track an external reference signal.

Communication and diagnostic functions are supported by a serial port that follows the RS-232-C standard, while the primary speed command is received through the real-time SERCOS interface. This arrangement allows diagnostic data to be handled through the serial connection while motion commands are exchanged on the optical control network. The drive can be installed at elevations up to 1000 m above sea level without derating, making it suitable for most factory locations. The unit is in series 3.