Product Description:

The RAC 2.3-200-460-LQ0-W1 is part of the Bosch Rexroth Indramat RAC Spindle Drive Controllers series. It is used in machining centers to regulate spindle motion, converting CNC commands into controlled motor torque and speed for cutting, milling, and drilling operations. Closed-loop control helps the spindle hold commanded speed during tool engagement and rapid changes in load. Stable regulation is especially useful when the machine shifts between roughing passes, finishing passes, and tool changes, because spindle behavior needs to remain predictable throughout the cycle. This supports consistent cutting conditions on automated equipment that runs varied spindle loads across repeated production steps.

The controller is rated for 200 A of output current, so the connected spindle motor can draw high dynamic current without immediate protective shutdown. Its mains input accepts 3 x AC 400 V or 3 x AC 460 V, which supports factory supplies that vary within the stated tolerance. Temperature rise inside the housing is managed by a built-in air blower that moves air across heat-sensitive components. Command and diagnostic data pass through X4 optical waveguides, while velocity setpoints are received over the SERCOS interface for real-time fiber-optic communication with the control system. Electrical isolation in the communication path helps the drive operate reliably around high-power spindle circuits and switching noise.

The drive is Series 2 and Version 3. It is supplied without an additional bleeder, so excess regenerative energy must be handled by the internal circuitry or by an external resistor at the cabinet level. Classified as an AC main spindle drive controller, the unit is intended for high-speed spindle applications where constant surface speed and quick acceleration are important to cut quality. It also supports machines that must maintain stable rotation as tool engagement, material load, and commanded speed change during operation.