5466-353 WOODWARD

The 9905/9907 series of the Woodward 2301A controls load sharing and speed 

of generators driven by diesel or gasoline engines, or steam or gas turbines. 

These power sources are referred to as “prime movers” throughout this manual.

The control is housed in a sheet-metal chassis and consists of a single printed 

circuit board. All potentiometers are accessible from the front of the chassis.

The 2301A provides control in either isochronous or droop mode.

The isochronous mode is used for constant prime mover speed with:

· Single-prime-mover operation;

· Two or more prime movers controlled by Woodward load sharing control 

systems on an isolated bus;

· Base loading against an infinite bus with the load controlled by an Automatic 

Power Transfer and Load (APTL) Control, an Import/Export Control, a Generator 

Loading Control, a Process Control, or another load-controlling accessory.

The droop mode is used for speed control as a function of load with:

· Single-prime-mover operation on an infinite bus or

· Parallel operation of two or more prime movers.

The following is an example of the typical hardware needed for the 2301A 

system controlling a single prime-mover and generator:

· A 2301A electronic control

· An external 20 to 40 Vdc power source for low-voltage models; 90 to 150 

Vdc or 88 to 132 Vac for high-voltage models

· A proportional actuator to position the fuel-metering device, and

· Current and potential transformers for measuring the load carried by the 

generator.

Applications

The 2301A 9905/9907 series electronic controls have switch-selectable speed 

ranges. Any of these control models can be set to operate within one of the 

following rated speed ranges:

· 500 to 1500 Hz

· 1000 to 3000 Hz

· 2000 to 6000 Hz

· 4000 to 12 000 Hz

The speed range is factory set for 2000 to 6000 Hz. Refer to the inside 

cover to change speed range and prevent possible overspeed. Using 

the wrong speed range could cause an overspeed with resulting 

damage to equipment and/or personal injury or death.

The Rated Speed potentiometer is the only multi-turn pot in this 

control. All other pots are single-turn. Take care not to turn these pots 

beyond their stops.