The speed of the engine is varied by {HEAD ~ operation} of a throttle controlled by a controller containing a predetermined engine map representing variation of engine speed as a function of {TAIL ~ the variation} in electrical power output from the frequency converter to meet the demand of an external electrical load 
The speed of the engine is varied by { HEAD ~ operation } of a throttle controlled by a controller containing a predetermined engine map representing variation of engine speed as a function of { TAIL ~ the variation } in electrical power output from the frequency converter to meet the demand of an external electrical load
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH