Boom operation from the cab or boom control station shall be automatic. From the operators cab, the boom can be moved to or from the passing position. From the boom control station, the boom can be moved to or from the fully raised position. A boom jam limit switch shall be provided and an encoder position threshold shall be used to automatically recalibrate the boom torque limit in the last 5 of travel approaching the fully raised position. If the motor current exceeds 95% of the recalibrated jam current limit value for more than 3 seconds, adjustable, the drive shall be automatically stopped and the holding brakes set.
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