Product Description:

The KDA 2.1-100-3-LQS-U1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. Classified as a spindle drive, it supplies regulated three-phase power to high-speed machine-tool spindles and processes velocity commands from a numerical control or motion controller. This arrangement supports automated machining centers that require stable spindle speed and coordinated motion with feed axes. It is intended for applications where spindle response must remain consistent during repeated cutting cycles.

This drive operates from a DC link voltage of 300 VDC and can deliver a continuous output of 100 A to the connected spindle motor. Speed reference data enter through the SERCOS interface, allowing synchronous setpoint exchange with other drive modules on the fiber-optic ring. Thermal management is handled by forced cooling, so the unit can sustain rated current without derating. The power section is rated for ambient temperatures between 5 to 45 °C, which suits typical shop-floor conditions. The unit is Series 2 in the KDA family, indicating its product generation within this line.

The heat sink blower itself is supplied from an auxiliary feed of 115 V at 50–60 Hz, so the cabinet must provide that single-phase source separately from the main DC bus. Cooling air is routed through a mounted heat sink blower assembly that projects through the rear panel and helps maintain airflow in tight racks. Proper performance is maintained up to 1000 m above sea level; above that height, thinner air reduces cooling efficiency and output must be reduced. For diagnostic access, the drive includes a Serial interface (RS-232-C) for local parameter access from a portable PC. This port supports direct communication when drive data must be checked without using the fiber-optic control network.