Product Description:

The KDA 3.2-100-3-LQS-U1 is a spindle drive from Bosch Rexroth Indramat that belongs to the KDA Spindle Drives series. Designed for precision machining equipment, the unit supplies variable-frequency output to high-speed spindle motors, letting a CNC controller regulate rotational speed and torque during cutting or grinding cycles. Acting as the power stage between a shared DC bus and the motor, the drive serves as a critical link in automated production lines that demand repeatable surface finishes and tight dimensional tolerances. Because spindle speed directly affects chip load and tool engagement, stable drive output is important for consistent machining results.

The drive operates from a DC link of 300 VDC, and this voltage is internally modulated into a three-phase waveform that the spindle can follow across its speed range. Under continuous duty, it can deliver up to 100 A, providing the current needed for rapid acceleration of large rotor masses. The resulting output lets the spindle motor develop controlled torque from low-speed startup through sustained high-speed rotation. Thermal loading is managed by forced cooling, and that airflow is generated by a mounted heatsink blower attached to the drive housing. The blower is powered by an auxiliary supply of 115 V 50/60 Hz, so the unit requires a separate single-phase feed. The cooling system helps keep power components within their intended operating range during prolonged machining cycles.

The drive maintains full performance within an ambient range of 5 to 45 °C, and installation is unrestricted up to 1000 m above sea level, avoiding derating in most industrial settings. Speed commands are exchanged digitally through the SERCOS interface, enabling deterministic cycle synchronization with other axes during coordinated machine motion. The digital command channel reduces timing variation between the spindle and feed axes in interpolated moves. Diagnostic data can be accessed through a secondary RS-232-C port for setup and troubleshooting. The serial connection provides a simple path for reading status information and fault data during service.