Product Description:

Bosch Rexroth Indramat's RAC 2.3-200-380-L00-W1/S002 belongs to the RAC Spindle Drive Controllers series. It functions as a closed-loop regulator for main spindle motors in CNC and other automated machining centers. By translating digital velocity commands into three-phase output for induction or synchronous spindles, the unit enables programmable speed profiles, rapid acceleration, and stable torque during cutting or grinding operations. This type of control helps the spindle hold the commanded speed when cutting loads change during operation.

The model is classified as an AC Main Spindle Drive Controller, so its control algorithms and power stage are tuned for continuous high-speed rotation rather than incremental positioning. Thermal management is handled by an internal blower with a built-in fan, which circulates cabinet air through the heat sink to maintain semiconductor junction temperatures within safe limits. The power section connects to a mains supply of 3 x AC 400 V, 50-60 Hz, matching common European plant distribution grids, and can deliver a steady output of 200 A to the spindle motor windings. Velocity setpoints arrive via the SERCOS interface, allowing deterministic fiber-optic communication with the machine controller while supporting parameter downloads, diagnostics, and synchronized multi-axis motion. This supports stable command transfer during rapid spindle speed changes.

I/O for higher-level control is present on the X4, optical waveguides terminal, which isolates drive electronics from electrical noise typical of high-power environments. Because the unit is supplied without an additional bleeder, excess regenerative energy must be dissipated by the DC bus or an external resistor in applications with frequent deceleration. It is also configured without an additional encoder input, so spindle position feedback is expected solely through the main motor encoder monitored by the SERCOS loop. The drive is Version 3 and uses the series 2 hardware platform.