Manual 82020
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.
NOTE
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 low- voltage model will be damaged
if connected to a high-voltage supply. The high-voltage model will not
operate with a low-voltage supply.
Symptom
Prime mover will not
DC supply voltage polarity
start. Actuator not
reversed, no supply voltage, or
moving to start-fuel
supply voltage is low.
position.
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.
Prime mover will not
Start fuel limit set too low.
start. Actuator not
moving to start-fuel
position.
No actuator voltage at terminals 9
and 10 while cranking.
Woodward
Chapter 5.
Troubleshooting
Cause
Check for supply voltage within limits indicated on
control name tag. Reverse leads if dc polarity is
incorrect.
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 Ω.
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.
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.
2301A Speed Control
Remedy
23
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