One side of the secondary of all CTs must be earthed. The earth connection should be made on the side of the secondary facing the protected object. The polarity of the CTs must be in accordance with the following diagram.
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.
