Woodward ProAct I, Product Manual, Page: 20 / 67

ProAct I/II Manual 04121
18 Woodward
Figure 2-5. Remote Speed Reference
Droop/Isochronous
The Droop/Isochronous switch allows selection of either type of governor
operation. If Droop is selected, the ProAct control will hold engine speed
according to a droop schedule entered in the program.
Figure 2-6. Droop Speed Setting
The droop schedule is based on a full 75 degrees of actuator rotation between
minimum and maximum fuel. If less than 75 degrees of rotation is used, the
amount of droop is reduced proportionally. Thus a control programmed for 5%
droop will actually only have 2.5% droop if only 37.5° of actuator rotation is used,
from no load to full load. Using only 37.5° of actuator travel will require
programming 10% droop for an actual 5% droop curve (a minimum of 66° of
travel is recommended).