SMC Networks VNB Series Operation Manual page 9

VNB Troubleshooting
Content of failure
□
Fluid leakage
□
Leakage from the P2 port
□
Operation failure
□
External leakage
□
Others
The shaded
Detailed failure content
□
Leakage from the valve seal
□
Others
□
Shaft seal leakage
□
Others
Insufficient pilot air
□
pressure
Increase in the sliding
□
resistance
□
Failure of the pilot valve
□
Others
□
O-ring failure
□ External force exists
□ Others
- 8 -
□
indicates the case of the solenoid valve type.
Entrainment of foreign matter
□
to the valve seal
Swelling and breakage of the
□
valve seal
□ Tearing of the valve seal
□
Deformation of the valve seal
Entrainment of foreign matter
□
to the shaft seal
Swelling and breakage of the
□
shaft seal
□
Wearing of the shaft seal
□
Setting pressure failure
Entrainment of foreign matter/
□
wearing
□
Voltage error
Air leakage due to entrainment
□ of foreign matter to the pilot
valve
O-ring getting caught or
□
forced out
External force to the pilot
□
valve
Possible causes
1
2
3
4
5
6
7
8
9
10
11
12
13
14