Trouble Shooting - SMC Networks VGA342R Series Operation Manual

Trouble shooting

Perform troubleshooting with hig her possibility based on the failure phenom enon.
Operation failure
Sealing failure
Problem
The pilot valve does not switch.
Pilot valve switches. Main valve does
not switch. Or, switching is delayed.
Air leakag e from the m ain valve air
exhaust [3(R ) port*]
*For body ported type and N.O .
specification, from 1(P) port.
Air leakag e from the g asket
Air leakag e from the pilot valve air
exhaust port (PE port).
Pilot pressure decreased.
F oreign m atter is caught in the pilot valve or spool valve.
External pilot pressure decreased.
O-ring is swollen.
Excessive lubrication
O-ring is worn.
Lodg ing of foreig n m atter.
Incom plete switch of spool valve
Sealing failure of actuators (such as cylinder)
Insufficient tig htening of the bolt
O-ring is swollen.
Foreig n m atter caug ht in the seat
- 9 -
Possible causes
No.VG300-OMH0006-B
C ounterm easures
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