Product Description:

The KDA 2.1-050-3-LY0-W1 spindle drive is manufactured by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Installed in machine-tool control cabinets, it converts the regulated DC link energy coming from an Indramat power supply into variable-frequency three-phase output for high-speed spindles. By tracking speed commands issued by numerical control systems, the unit enables precise cutting, drilling, or grinding rates and helps maintain consistent chip load, surface finish, and tool life across industrial automation processes.

It operates from a DC link of 300 VDC supplied by the common supply module and can deliver a continuous output of 50 A to the connected spindle motor. The cooling section uses an auxiliary line rated at 220 V/50/60 Hz to energize its blower, ensuring fan operation even when the main power stage is inhibited. Heat is removed through forced cooling that pushes ambient air across a large finned assembly with a mounted heat sink blower, allowing full current during cyclic loads typical of tapping or rapid tool-change sequences. The unit is series 2, and no additional interface cards are fitted, so all backplane slots remain vacant.

For enclosure planning, the permissible ambient range is 5 °C to 45 °C, and heat sink calculations must also respect the altitude limit of 1000 m above sea level where nominal ratings remain valid. Speed setpoints arrive through the real-time SERCOS interface, providing fiber-optic noise immunity and deterministic update cycles. Position feedback options include a second encoder input combined with a synchronous trigger channel, enabling spindle orientation, threading, or C-axis interpolation without external gearboxes. Installation wiring is limited to power, SERCOS fibers, encoder leads, and the blower supply, which helps keep cabinet routing straightforward.