Troubleshooting - SMC Networks SYJ Series Operation Manual

TROUBLESHOOTING

Should any trouble be found during operation, trace the source of the trouble in the following order and take corrective action.
Trouble phenomenon
Faulty operation
Leakage
Pilot valve is not operated
Though pilot valve does
shift, but main valve will not
shift or will be sluggish.
Burnt coil
Air leaks through exhaust
port of main valve
Air leaks through gasket
Air leaks through pilot
exhaust port of pilot valve
- 14 -
Cause expected
Faulty wiring
Blown fuse or disconnection lead wire
Poor contact at contactor wire or connection part
Disconnection coil wire
Foreign matter caught in armature
Fall of pilot pressure
Swelled out " spool ass'y " ring
Excessive amount of lubricant
Higher voltage or wrong coil used
Coil splashed by water
Abrasion " spool ass'y" ring(in the case of rubber seal)
Poor operation or adherence
Intrusion of foreign matter
Spool has not completely shifted
Poor seal on actuator (cylinders, etc.) side
Insufficient bolt tightening
Foreign matter caught in air seat of pilot valve
Foreign matter caught in core of pilot valve
No.SYJ3000-OMM0002-A
Measures
①
②
③
④
⑤
⑥
⑫
⑦
⑧
⑨
⑤
⑥
⑩
⑪
④