5466-033 WOODWARD

This manual covers Electrically Power Governor (EPG) models 512/524 and 

1712/1724. Refer to the appropriate manual or contact Woodward for information 

about other versions of the EPG. 

Application 

The EPG is used to control the speed of diesel, gas, and gasoline engines. It can 

also control the speed of gas turbines. Installation of EPG actuators is simple 

because they require neither mechanical drive nor hydraulic supply. 

The EPG handles prime movers with mechanical loads and generator loads 

equally well. Generator sets which will be paralleled, however, require additional 

appropriate switch gear, current and potential transformers, and the Woodward 

Generator Load Sensor. 

An EPG is a three-component system, requiring a magnetic pickup, speed 

control, and actuator. 

A battery charger must be used to keep the battery charged. Maximum steady 

state current consumption is 4 A for the 12-volt models (512/1712), and 3 A for 

the 24-volt models (524/1724). 

Part Number Selection 

Use EPG Model 512/1712 for operation in 12-volt systems. Use Model 524/1724 

for operation in 24-volt systems. 

Additionally, speed controls are available for four ranges of magnetic pickup 

frequencies, for diesel engines and gas turbines, or for gasoline and gas 

engines. Actuators have a double-ended output shaft for either clockwise or 

counterclockwise rotation to increase fuel. 

Speed controls and actuators must be compatible. Use the Part Number 

Selection Table below (Table 1-1) to choose compatible EPG speed controls and 

actuators. 

The optional Start Fuel Limit feature allows setting a maximum actuator position 

during start-up. The maximum position remains in effect until the engine reaches 

the selected idle or rated speed. The limit may be adjusted out of the way by 

turning the adjustment potentiometer fully clockwise. 

The Dual Dynamics feature allows tailoring a special set of responses for 

unloaded and loaded operating conditions. This type of control is often needed 

for gas engines and other systems with non-linear fuel systems. A switch is used 

to change between slow and fast dynamics.