Troubleshooting - SMC Networks VNB Series Operation Manual

No. How to check the cause
Remove the cover assembly and check that
no foreign matter is stuck to the valve
□
1
seal.
Remove the cover assembly and check that
there is no swelling and breakage of the
□
2
valve seal.
Remove the cover assembly and check that
there is no tearing on the rubber part of
□
3
the valve seal.
Remove the cover assembly and check that
there is no deformation of the rubber part
□
4
of the valve seal.
Check that no foreign matter has entered
the shaft seal of the plate.
□
5
Check that there is no swelling and
breakage on the shaft seal of the plate.
□
6
Check that there is no abnormal wearing
on the seal of the plate.
□
7
Check the pilot pressure.
□
8
Check that there is no foreign matter
stuck inside the valve.
□
9
Check that the voltage applied is within the
operating specifications while the valve is
□
10
energized.
Check that there is no air leakage from the
P2 port. (in case of N.C)
11 □
Check for signs of the O-ring of the plate
getting caught or forced out.
□
12
Check for signs of external force having
been applied to the pilot valve.
□
13
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14 SMC will investigate.
The following information is required for investigation, so please send it to your sales representatives.
- Detailed content of the failure - Operating cycle - Operating fluid - Machine used
- Operating temperature - Fluid pressure - Pilot pressure
Foreign matter entered from outside might get stuck to the seal.
Take measures to prevent entrainment of foreign matter.
□
The rubber on the valve seal failed.
Check whether the fluid contains components which deteriorate the rubber of
□
the main valve.
The adhesive strength of the rubber has reduced due to the effect of the fluid
and atmosphere.
□
Perform maintenance as soon as possible or change the rubber material.
The rubber has deteriorated due to the effect of the fluid and atmosphere.
Perform maintenance as soon as possible or change the rubber material.
□
Foreign matter has entered from outside and got stuck to the seal.
Take measures to prevent entrainment of foreign matter.
□
The rubber on the shaft seal failed.
Check whether the fluid contains components which deteriorate the rubber of
□
the main valve.
The shaft seal failed because it was used for a long time and grease was running
out.
□
Perform maintenance at an early stage by replacing the plate assembly.
The setting pressure failed due to insufficient pilot pressure.
Adjust the pilot pressure within the operating pressure range.
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Foreign matter entered the valve and got stuck to the sliding part.
Take measures to prevent entrainment of foreign matter.
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The pilot valve failed because the voltage applied was not within the operating
range.
□
Check the voltage fluctuation and use the voltage within the operating range.
Foreign matter entered the pilot air piping and got inside the solenoid valve
causing air leakage, leading to insufficient pilot pressure.
□
Take measures to prevent entrainment of foreign matter.
The O-ring of the plate was caught in the body or cover during maintenance.
Assemble so that the O-ring of the plate is not caught during maintenance.
□
External force was applied to the pilot valve.
Do not apply external force to the pilot valve.
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Troubleshooting