Woodward Large Electric Sonic Valve II, Инструкция по установке и эксплуатации, Страница: 50 / 66

Manual 35076 LESV II
Woodward 48
Chapter 5.
Troubleshooting
Faults in the fuel control or governing system are often associated with speed variations of the prime
mover, but such speed variations do not always indicate fuel control or governing system faults.
Therefore, when improper speed variations occur, check all components, including the engine or turbine,
for proper operation. Refer to the applicable electronic control manuals for assistance in isolating the
trouble. The following steps describe troubleshooting for the gas fuel control valve.
Disassembly of the Large Electric Sonic Valve in the field is not recommended due to the dangerous
forces contained in the springs. Under unusual circumstances, where disassembly becomes necessary,
all work and adjustments should be made by personnel thoroughly trained in the proper procedures.
When inspecting the valve for suspected blockages remove the valve from the fuel system and only
inspect with the unit powered off.
The LESV II contains a mechanical spring under load. Do not
disassemble, as this spring can cause bodily harm.
When inspecting the valve internally through the flanges for potential
blockages remove the valve from the fuel system and ensure that all
power and electrical cables are disconnected. Never place hands
inside the valve without ensuring that power is disconnected and the
position indicator shows the valve is at the closed position.
Do not operate the valve without proper support for the diverging
sleeve. The diverging sleeve can only be properly supported by
bolting and by properly torqueing the outlet flange to either piping or
an equivalent flange. Do not place hands inside the valve body
during inspection, cleaning, or operation.
Note: When requesting information or service help from Woodward, it is important to include the part
number and serial number of the valve assembly in your communication.
Table 5-1. Troubleshooting Symptom, Cause, and Remedy
Symptom Possible Causes Remedies
Valve will not open because the
DVP will not reset
Motor wires not properly
connected between DVP and
actuator Conduct continuity check.
Resolver wires not properly
connected between DVP and
actuator Conduct continuity check.
DVP will reset but valve will not
open
Resolver sine wires high and low
are flipped Conduct continuity check.
Resolver cosine wires high and
low are flipped Conduct continuity check.
Resolver sine and cosine wires
are swapped Conduct continuity check.
Released