Product Description:

The KDA 3.2-050-3-LPS-W1 is a spindle drive module produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. In a multi-axis cabinet, it draws energy from a common DC bus and delivers three-phase output to a high-speed spindle motor, allowing precise velocity and torque regulation during machining. By linking the supply module to the motor and processing encoder signals, the unit supports rapid acceleration, controlled braking, and synchronized cutting operations required by modern CNC equipment. Because it operates from a shared DC bus, the module fits centralized drive systems where several axes use the same power infrastructure and braking path. This arrangement helps the spindle maintain stable speed during changing load conditions in milling, drilling, and other continuous machining tasks.

Electrical power is taken from a DC link rated at 300 VDC, which is the intermediate-circuit voltage switched by the drive’s transistors. The current stage can deliver up to 50 A continuously, which sets the continuous load level for the spindle circuit. A separate single-phase feed of 220 V/50–60 Hz supplies the blower so cooling remains active even when the main DC bus is disabled. That fan is an integrated mounted heat sink blower and operates with forced cooling, pushing air across the power electronics to maintain acceptable semiconductor temperatures during extended high-speed cutting cycles. Keeping the blower on a separate supply also helps preserve airflow during bus shutdowns and controlled stopping sequences.

The unit operates without derating between 5 to 45 °C and at altitudes up to 1000 m above sea level, which suits typical machine-shop conditions. Velocity commands arrive through a fiber-optic SERCOS interface, providing deterministic real-time control, while parameter adjustment and diagnostics can be handled over the built-in serial interface (RS-232C). The serial connection also allows direct access to status values and setup data without interfering with the real-time command channel used for spindle motion. An additional encoder socket accepts spindle or auxiliary motor feedback, allowing the controller to close position loops with high-resolution signals. The communication and feedback connections support stable spindle control during speed changes, orientation moves, and other coordinated machine functions.