Product Description:

The KDA 2.1-050-3-LQ0-W1 is a spindle drive from Bosch Rexroth Indramat in the KDA Spindle Drives series. It is designed to regulate high-speed motorized spindles in machining centers and similar equipment, converting shared DC link power into controlled three-phase output while monitoring current, speed, and thermal conditions. This allows the spindle to respond accurately to commanded speed changes and load variations during cutting. The drive supplies the stable torque and velocity control needed for milling, drilling, and grinding processes where consistent spindle behavior supports surface quality and tool life in automated machine tools.

The power section is rated for a continuous phase current of 50 A, enabling the module to drive medium-frame spindles without derating. It draws energy from a shared link of 300 VDC, so multiple axes can be powered from one converter cabinet. Thermal stabilization relies on a mounted heat sink blower attached directly to the aluminum cooling plate. The unit uses forced cooling, so blower operation is required whenever the drive is enabled. Ambient conditions may range from 5 to 45 °C, allowing installation in typical factory environments without refrigerated air.

Auxiliary services for the cooling fan require an AC feed of 220 V/50–60 Hz, so the blower remains independent of the DC bus during startup and emergency stop conditions. Proper operation is permitted up to 1000 m above sea level, because reduced air density above that height lowers heat transfer and available current capacity. Speed references reach the controller through a SERCOS interface, providing deterministic fiber-optic communication with the machine CNC for the spindle axis. The same link carries cyclic control data needed for coordinated motion with the rest of the machine. The drive has no additional interface option, so diagnostics, parameter access, and command values pass through the primary communication channel.