R911256133 (RAC 2.3-250-380-AP0-W1)

RAC Spindle Drive Controllers

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The R911256133 (RAC 2.3-250-380-AP0-W1) is a RAC 2 main spindle drive controller designed to operate Indramat 2AD and 1 MB frameless spindle motors digitally. Particularly well suited for numerically controlled machine tools, thanks to its high motor shaft stiffness and continuous power across a wide speed range. Featuring an in-built position control loop, which, utilizing motor or optional spindle feedback, is capable of precision spindle positioning. This drive controller offers maximum resolution up to 1/4,000,000th of a revolution. Operational on a 3-phase power supply, it includes a mains contactor and emergency circuit breaker, and can recycle power during braking, even during emergency stops. Moreover, it has DC braking capability to stop spindle during power failures, and is easily cooled using inside and outside control cabinet air. The R911256133 (RAC 2.3-250-380-AP0-W1) needs 400A of current and includes an analog speed setpoint with an additional encoder input, but excludes an additional bleeder. It ships globally under a standard 1-year warranty.