SMC Networks SYJ3000 Series Operation Manual page 26

TROUBLE SHOOTING
For valve non-conformance, take following
Trouble
countermeasures referring to trouble.
The valve operates
when the manual
override button is
pushed?
Yes
Energized?
Is valve switched?
Malfunction
Yes
No air
changeover.
1) Operation failure or sticking of the
No
main valve.
●Foreign matter from the piping and air
source got caught in the main valve,
causing a malfunction.
●Malfunction occurred due to sticking
such as swelling of the rubber part of
the main valve.
2) Pressure drop
Air source pressure is reduced and
minimum operating pressure of the
valve was not reached, causing an
operation failure.
3) Excessive oil supply
Due to excessive lubrication, oil
accumulated inside the valve, causing
malfunction.
1) Non-conformance of electric system
No
- Incorrect wiring
- Fuse blown out, lead wire broken
- Incorrect contact at the contact and
connection
- Sequencer non-conformance
- Supply voltage insufficient
2) Drop of supply voltage
Operation failure of the valve due to
voltage drop.
3) Non-conformance of the installed
pilot valve
- Broken wire in the coil or burnout
(High supply voltage, incorrect coil
specification, entry of water)
1) Leakage current
Operation failure of the valve occurred
due to residual voltage.
(Valve is not turned OFF)
2) Non-conformance of the installed
pilot valve
- Foreign matter is caught in the moving
part of the valve (or pilot valve).
- Swelling of rubber parts inside the valve
(or pilot valve)
- 25 -
Possible cause Countermeasures
- Replace the valve.
- Clean the air supply.
- If incorrect oil has been used for
lubrication, remove the oil by air blow.
- If there is a large amount of condensate
or condensate cannot be removed
completely, mount an auto drain or install
a dryer and replace the valve.
- Adjust the pressure within the
specification range for the valve.
- Reduce the amount of lubrication to the
amount at which the oil does not splash
from the exhaust port [5/3 (EA/EB)].
- Check all parts and replace the part, if
necessary.
- Check the supply voltage.
- Check the supply voltage. Take
corrective action if voltage drop is
confirmed.
- Replace the valve.
- Protect the valve especially the coil to
prevent being exposed to water.
- Check the residual voltage.
- Keep the residual voltage at 3% of the
rated voltage or less.
- Clean the air supply.
- Eliminate foreign matter with air blow.
- Replace the valve when actions above
do not improve the condition.
No. SYJ3000-OMM0002-B