However, if, as a result of an increase or decrease in the load requirement of load 78, the frequency of the voltage from frequency sensor 80 differs from the reference frequency, {HEAD ~ an error voltage} from {TAIL ~ summer} 82 is provided 
However , if , as a result of an increase or decrease in the load requirement of load 78 , the frequency of the voltage from frequency sensor 80 differs from the reference frequency , { HEAD ~ an error voltage } from { TAIL ~ summer } 82 is provided
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH