Product Description:

The RAC 2.3-200-460-A0I-Z1 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 three-phase utility power into regulated output for machine-tool spindles and supports accurate speed control during cutting, drilling, and similar automated machining tasks. This arrangement lets the CNC command spindle speed changes quickly while the drive manages current and voltage to keep operation stable under varying load. Because spindle speed directly affects surface finish and tool loading, stable regulation at the drive level is important in turning centers, machining centers, and other equipment that depends on repeatable spindle behavior.

Its thermal management uses a built-in blower that circulates cabinet air through the heat sink, eliminating the need for external ducting. The power section accepts 3 × AC 400 V, 50 Hz, ±15 % or 3 × AC 460 V, allowing direct connection to common European or North American mains. Continuous output reaches 200 A, so the surrounding power distribution must be sized for substantial spindle demand during acceleration and steady operation. Speed references are delivered through an analog ±10 V input, which fits legacy CNC velocity loops without extra signal conversion. Control, enable, and monitor signals connect through X4 with 9 poles, keeping low-voltage wiring grouped on a single detachable plug. Separating the power terminals from the control connector also helps keep command wiring organized inside compact cabinets.

Regenerative energy during spindle braking is absorbed by an additional bleeder, which helps prevent DC-link overvoltage when high-inertia loads decelerate. The unit comes without an additional encoder input, so any auxiliary feedback channel must be provided elsewhere in the system while the primary spindle encoder remains assigned to the drive. For diagnostics or handwheel-related functions, an incremental encoder output retransmits position data at TTL level. That arrangement is useful in retrofit systems where the spindle loop and external measuring channels are handled by different hardware. The controller layout supports integration with established machine-tool architectures that rely on analog command signals and separated feedback paths, which keeps it compatible with many existing control schemes.