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