Product Description:

The RAC 2.3-250-460-L00-W1 is a spindle drive controller produced by Bosch Rexroth Indramat for the RAC Spindle Drive Controllers series. As an AC main spindle drive controller, it converts commanded input into regulated three-phase motor output for CNC lathes, mills, and grinding machines. This allows the connected spindle to maintain stable speed during cutting, drilling, and other machining steps where repeatable surface finish and tool performance matter. Stable electronic speed regulation is especially important when machining conditions shift from roughing to finishing, because the spindle has to respond smoothly to changing loads.

Its continuous output capability of 250 A allows the unit to operate large spindle motors without overloading the power stage. The permissible supply range is 3 x AC 400 V, 50 Hz, ±15%, or 3 x AC 460 V, which supports common industrial power systems in Europe and North America. Internal thermal control uses a built-in fan, so airflow is provided inside the unit without external ducting. Velocity commands are transmitted through the SERCOS interface, and service access is available at the X4 optical waveguide terminal. Fiber-optic communication helps maintain signal quality in machine cabinets that also contain power devices and motor wiring. The controller is supplied without an additional bleeder, so braking energy must be handled by the spindle system or by an external resistor.

The controller uses hardware release 2 and revision 3 for this version of the product. It is configured without an additional encoder input, so only the primary spindle feedback channel is accepted by the drive. That arrangement leaves any secondary position loop to the CNC control rather than to the spindle drive itself. This setup is suitable where the spindle system does not require a separate auxiliary encoder channel for added measurement or process tracking.