stopping the swiveling of the nacelle by the nacelle swiveling mechanism when {HEAD ~ the wind speed} obtained from the measurement result of the anemometer is not greater than {TAIL ~ the first threshold} 
is not greater than
stopping the swiveling of the nacelle by the nacelle swiveling mechanism when { HEAD ~ the wind speed } obtained from the measurement result of the anemometer is not greater than { TAIL ~ the first threshold }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL