SMC Networks ex250-sen1 Operation Manual page 22

Trouble
Trouble No.1
Trouble Possible cause
Only the
solenoid valve Solenoid valve failure
LED lights up
Trouble No.2
Trouble Possible cause
The outputs Inadequate total
that are number of outputs
beyond the from the solenoid
maximum valves and Output
point number block connected with
do not operate. the SI unit
Trouble No.3
Trouble Possible cause
Incorrect wiring for the
power supply for
solenoid valve and
the power supply for
output
Failure of the power
supply for the
solenoid valve and
output
Only the
solenoid
valve/Output
block LEDs do
Incorrect connection
not light up
between the SI unit
and the solenoid
valve and/or output
block
Intrusion of liquids
such as water
Investigation method of cause
Check the troubleshooting for the solenoid
valve.
Investigation method of cause
Check if the total number of outputs is 32 or
less (24 for the solenoid valve VQC series).
Investigation method of cause
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.
Check that there is no incorrect wiring of
the power supply cable.
Check the supply voltage 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.
Check if the Output block (for high wattage
and load and low wattage and load) and
power block are mounted in the right
position.
Check that unused connectors of the
Output block and Power block are plugged
with waterproof caps.
-21-
Remedy
Correct the trouble of the
solenoid valve.
Remedy
Eliminate extra unused
outputs from the manifold to
ensure the number of outputs
is 32 or less.
Remedy
Review the connection
condition of the power supply
cable. (If the cable is broken,
replace it with a new one.)
Review the wiring condition
of the power supply cable.
Supply 24 VDC +10%/-5% to
the power supply for the
solenoid valve and output.
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)
Review the position of the
Output block and Power
block.
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.
No.EX##-OMK0004-A