Troubleshooting - SMC Networks VPX400 Series Operation Manual

Troubleshooting

Symptom
The valve does not open.
The valve does not close.
The pressure sensor does not
operate as shown in the diagnosis
Note 1) Note 2)
test or monitoring test .
Abnormal sound is generated in the
valve, and the valve operation is
unstable.
Supply of protected system by valve
is slow.
Exhaust from protected system by
valve is slow.
Note1) Refer to Section 2 of "Maintenance" of this operation manual.
Note2) Refer to Section 3 of "Maintenance" of this operation manual.
Note3) Refer to the air supply and operating environment in (2) of "Common Precautions."
If the countermeasures above are not effective, there may be a problem with the valve.
In that case, stop using the valve immediately.
If any of the examples below are applicable, there may be an internal problem with the valve. In that case, stop using the valve immediately.
(1) The voltage used was not the rated voltage. (2) The product was directly exposed to water (3) Severe impact was applied.
(4) Foreign matter such as condensate or dust has entered the product (5) Other than the cases (1) to (4) above, any usage which falls into the
precautions given in this operation manual. *If the product has failed, then please return the valve as it is.
Possible causes
The pilot valves (2 pcs.) are not energized.
The supply pressure is too low.
The pilot valve or main valve has failed.
[The valve does not open even when the pilot valves (2
pcs.) are energized and the supply pressure is within the
specification range.]
The pilot valves (2 pcs.) are energized.
The supply pressure is too high.
The pilot valve or main valve has failed.
[The valve does not close even when the pilot valve(s) (1
pc. or 2 pcs.) is(are) not energized and the supply
pressure is within the specification range.]
The pressure sensor is not energized.
The supply pressure is out of the specification range.
The pressure sensor has failed.
[The pressure sensor does not operate as shown in the
Note 1)
diagnosis test or monitoring test
pressure sensor is energized and the supply pressure is
within the specification range.]
The supply flow rate is insufficient.
The operating frequency is too high.
The supply pressure is out of the specification range.
The valve has failed.
[When abnormal sound is generated in the valve or the
valve operation is unstable even when the supply flow
rate is sufficient and the operating frequency and supply
pressure are within the specification ranges.]
The supply flow rate in the protected system is
insufficient.
The flow rate in the protected system is insufficient.
A single channel in the valve is not functioning.
The exhaust silencer is dirty or clogged.
- Confirm that the LEDs (SOL.1/SOL.2) of the pilot valve are lit.
- Confirm that the voltage is within the specification range.
- Confirm that the supply pressure is within the specification
range.
- Replace the whole valve.
- Confirm that the LEDs (SOL.1/SOL.2) of the pilot valve are not
lit.
- Confirm that the leakage voltage to the pilot valves (2 pcs.) is
3% of the rated voltage or less.
- Confirm that the supply pressure is within the specification
range.
- Replace the whole valve.
- Confirm that the LED (SEN.PWR.) of the pressure sensor is lit.
- Confirm that the voltage is within the specification range.
- Confirm that the supply pressure is within the specification
range.
Note 2)
even when the - Replace the whole valve.
- Increase the supply pressure or flow rate.
- Confirm that the operation frequency is within the specification
range.
- Confirm that the supply pressure is within the specification
range.
- Replace the whole valve.
- Increase the supply pressure or needle flow rate.
- Decrease the volume of the protected system.
- Increase the flow path in the protected system.
Change the flow rate in the protected system.
Refer to the troubleshooting for the case where the above valve
does not close.
Conduct inspection and replacement as necessary, and check
the quality of compressed air and operating environment
- 21 -
Corrective action
No. DOC1092179
Note 3)
.