R911270421 (RAC 2.3-200-460-LQ0-W1)

RAC Spindle Drive Controllers

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The Bosch Rexroth R911270421 (RAC 2.3-200-460-LQ0-W1) is a main spindle drive controller designed to digitally manage Indramat frameless and asynchronous spindle motors. This high-efficiency drive system is scalable and compact for easy integration within industrial applications. Its key functions include speed command ramps and smoothing, power and torque limiting, automatic speed change, and spindle positioning. Operable as a main spindle drive, master-slave drive or c-axis drive, the R911270421 (RAC 2.3-200-460-LQ0-W1) has a 300-amp current rating and offers direct main connection at 3x400 volts AC in three phases. Its weight is 121 kilograms excluding accessories and the mounting frame. The unit has an IP54-rated protection class when installed as per guidelines, and an in-built fan for cooling purposes. Its SERCOS fiber optic interface allows for precise data and diagnostic signal transmission. The model also features a numerically controlled actuator for the main contactor and ships globally with a one-year warranty from Indramat USA.