9905-990 WOODWARD

The following troubleshooting guide is an aid in isolating trouble to the control 

box, actuator, plant wiring, or elsewhere. The guide assumes that the system 

wiring, soldering connections, switch and relay contacts, and input and output 

connections are correct and in good working order. Make the checks in the order 

indicated. 

The wrong voltage can damage the control. When replacing a 

control, check the power supply, battery, etc., for the correct voltage 

as indicated on the name tag on the control. Both high-voltage and 

low- voltage models of 2301A speed controls are available. The lowvoltage model will be damaged if connected to a high-voltage supply. 

The high-voltage model will not operate with a low-voltage supply. 

Symptom Cause Remedy 

Prime mover will not 

start. Actuator not 

moving to start-fuel 

position. 

DC supply voltage polarity 

reversed, no supply voltage, or 

supply voltage is low. 

Check for supply voltage within limits indicated on 

control name tag. Reverse leads if dc polarity is 

incorrect. 

Actuator not responding to input 

signal from control. 

NOTE

Hydraulic actuators must have oil 

pressure and either gear rotation 

or oil motor rotation to operate. 

If there is a voltage output at terminals 9 and 10, 

but the actuator does not move, the wiring to the 

actuator should be checked for opens or shorts. 

With the EG3P actuator, remember that terminals C 

and D of the mating plug must be jumpered. 

Coil resistance in a Woodward actuator with 

terminals 9 and 10 disconnected, is about 35 W. 

Prime mover will not 

start. Actuator not 

moving to start-fuel 

position. 

Start fuel limit set too low. Turn start fuel limit cw until prime mover starts. 

Check actuator and linkage for proper installation 

and operation. Problems may be oil supply, 

direction of rotation, insufficient drainage, linkage, 

worn actuator components, or improper adjustment. 

No actuator voltage at terminals 9 

and 10 while cranking. 

Stop cranking. Check for shorted or grounded 

actuator leads by removing wires to terminals 9 and 

10. Close terminal 4, short terminal 11 to 12. Check 

for 18 to 22 volts at terminals 9 and 10 for forward 

acting controls and 0 to 1 volts for reverse acting 

controls. 

While cranking, check for at least 1 Vrms at 

terminals 7 and 8, and at least 30 to 80 Hz. 

If these readings are not available close terminal 4 

to override failed-speed signal while cranking. 

MPU sensor spaced too far from gear. Make sure 

there are no metal chips on end of pickup. Check 

MPU wiring and shields. 

Speed setting too low on initial start. Control may 

be set for the wrong speed range. Check speed 

sensor frequency versus control part number. 

Speed setting may be lower than cranking speed. 

Control should be set for rated speed. Increase 

RATED SPEED setting clockwise (cw). 

Be sure and return rated speed setting full ccw if 

adjusting cw does not produce the correct output.