R911256138 (RAC 2.3-250-380-L00-W1)

RAC Spindle Drive Controllers

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The R911256138 (RAC 2.3-250-380-L00-W1) from Bosch Rexroth Indramat is a 3-phase digital main spindle drive controller designed to excel in high stiffness and power applications. Compatible with 1MB Indramat frameless motors or the 2AD series motor, it offers internal positioning loop control and can support up to 1/4,000,000 revolution resolutions. With a voltage and current rating of 3x AC 400V/50-60Hz and 400 Amps respectively, this series-2 RAC model features a SERCOS interface for real-time set-point parameterization and value determination of speed, torque, and position. Lacking an additional encoder input, interface, or bleeder, it employs an AS programming module that adjusts operations according to the attached main spindle motor. Heat generated during usage is dissipated through the controller's air slits, heat sink, and a built-in fan. Distances of 125mm and 260mm from horizontal and vertical barriers respectively are recommended during installation for airflow optimization. Cleanliness of the heat sink is crucial for safe operation. It comes with a one-year global warranty from Indramat USA.