SMC Networks EX250-SEN1, Operation Manual

-21- 

No.EX##-OMK0004-A 

Trouble 

Trouble No.1 

Trouble 

Possible cause 

Investigation method of cause 

Remedy 

Only the 
solenoid valve 
LED lights up 

Solenoid valve failure 

Check the troubleshooting for the solenoid 
valve. 

Correct the trouble of the 
solenoid valve. 

Trouble No.2 

Trouble 

Possible cause 

Investigation method of cause 

Remedy 

The outputs 
that are 
beyond the 
maximum 
point number 
do not operate. 

Inadequate total 
number of outputs 
from the solenoid 
valves and Output 
block connected with 
the SI unit 

Check if the total number of outputs is 32 or 
less (24 for the solenoid valve VQC series).

Eliminate extra unused 
outputs from the manifold to 
ensure the number of outputs 
is 32 or less. 

Trouble No.3 

Trouble 

Possible cause 

Investigation method of cause 

Remedy 

Check that the power supply cable for the 
solenoid valve and output is not broken, 
and that the connection between the power 
supply cable and connector has not 
loosened. 

Review the connection 
condition of the power supply 
cable. (If the cable is broken, 
replace it with a new one.) 

Incorrect wiring for the 
power supply for 
solenoid valve and 
the power supply for 
output 

Check that there is no incorrect wiring of 
the power supply cable. 

Review the wiring condition 
of the power supply cable. 

Failure of the power 
supply for the 
solenoid valve and 
output 

Check the supply voltage to the power 
supply for the solenoid valve and output. 

Supply 24 VDC +10%/-5% to 
the power supply for the 
solenoid valve and output. 

Check that the bolt joining the SI unit with 
the solenoid valve and Output block has not 
loosened. 

Tighten the bolts by hand so 
that there is no gap between 
the SI unit and the solenoid 
valve and/or Output block. 
Tighten at the specified 
torque. 
(Tightening torque: 0.6 Nm) 

Incorrect connection 
between the SI unit 
and the solenoid 
valve and/or output 
block 

Check if the Output block (for high wattage 
and load and low wattage and load) and 
power block are mounted in the right 
position. 

Review the position of the 
Output block and Power 
block. 

Only the 
solenoid 
valve/Output 
block LEDs do 
not light up 

Intrusion of liquids 
such as water 

Check that unused connectors of the 
Output block and Power block are plugged 
with waterproof caps. 

If liquid such as water has 
got into the Output block 
and/or Power block, replace 
the Output block and Power 
block with new ones.