SMC Networks EX245-SPN1 Operation Manual page 59

Table. 12-3 Troubleshooting for the problem with display on US1/2 LED
No. Problem
1 US1 indicator is OFF.
2 US1 indicator is flashing.
3 US2 indicator is OFF.
4 US2 indicator is flashing.
Table. 12-4 Troubleshooting for malfunction of the solenoid valve
No. Problem
A solenoid valve is not
5
operating.
Possible cause
Incorrect wiring.
US1 is not present or below the
dropout level
(< approx. 17 VDC).
US1 is below the permissible level
but above the dropout level (17 to
21.6 VDC).
Incorrect wiring.
US2 is not present or below the
dropout level
(< approx. 17 VDC).
US2 is below the permissible level
but above the dropout level (17 to
22.8 VDC).
Possible cause
Incorrect connection.
Solenoid valve is faulty.
US2 is not present or below the
dropout level
(< approx. 17 VDC).
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Remedy
・ Check the cable.
・ Check the wiring and pin numbers.
Check the supply for the logic/sensors
of SI unit.
Check the supply for the logic/sensors
of SI unit.
・ Check the cable.
・ Check the wiring and pin numbers.
Check the supply for the valves/loads.
Check the supply for the valves/loads.
Remedy
Check the connection with the SI Unit.
Check the solenoid valve.
・ Check the supply for the valves.
・ Check the wiring and pin numbers.
No.EX##-OMU0020-A