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