WOODWARD PSG GOVERNORSSYSTEMS OPERATIONSPEED DROOPSpeed droop is the difference between no load rpmand full load rpm. This difference in rpm divided by thefull load rpm and multiplied by 100 is the percent ofspeed droop.Noloadspeed-Fullloadspeedx 100 =% of speedFull load speeddroopThe speed droop of the PSG governor can beadjusted by movement of an adjustment lever on theoutside of the governor that is connected to pivot pin (2)by link (4). The governor is isochronous when it isadjusted so that the no load and full load rpm is thesame. Speed droop permits load division between twoor more engines that drive generators connected inparallel or generators connected to a single shaft.PSG GOVERNOR1. Bracket. 2. Pivot pin. 3. Output shafts.Speed droop adjustment on PSG governors is madeby movement of pivot pin (2). When the pivot pin is putin alignment with the output shafts. movement of theoutput shaft lever will not change the force of thespeeder spring. When the force of thespeeder spring is kept constant the desired rpm will bekept constant. See PILOT VALVE OPERATION. Whenthe pivot pin is moved out of alignment with the outputshafts, movement of the output shaft lever will changethe force of the speeder spring proportional to the loadon the engine. When the force of the speeder spring ischanged the desired rpm of the engine will change.PSG GOVERNOR2. Pivot pin. 4. Link.9
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