SMC Networks ex250-sen1 Operation Manual page 25

Trouble No.8
Trouble Possible cause
Incorrect wiring for the
power supply for
solenoid valve and
the power supply for
The SI unit
output
SOL_LED
goes off.
Failure of the power
supply for the
solenoid valve and
output
Trouble No.9
Trouble Possible cause
The SI unit
Abnormal status of
MS_LED goes
the SI unit.
off.
Trouble No.10
Trouble Possible cause
Abnormal status of
the SI unit.
The red SI unit
MS_LED lights
up.
SI unit failure.
Trouble No.11
Trouble Possible cause
The red SI unit
Abnormal status of
MS_LED
the SI unit.
flashes.
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.
Investigation method of cause
Check if the Earth terminal is grounded.
Check if the power supply line is in the
same route as the power line and/or high
voltage line
Investigation method of cause
Check if the Earth terminal is grounded.
Check if the power supply line is in the
same route as the power line and/or high
voltage line.
Replace the SI unit with a new one and
operate to check the normal operation
recovers.
Investigation method of cause
Check if the Earth terminal is grounded.
Check if the power supply line is in the
same route as the power line and/or high
voltage line.
-24-
Remedy
Review the connection
condition of the power supply
cable. (If the cable is broken,
replace it with 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.
Remedy
Provide grounding to
improve the noise resistance
of the reduced wiring system.
Separate the power supply
cable from the power line
and/or high voltage line and
restart the power supply of
the SI unit.
Remedy
Provide grounding to
improve the noise resistance
of the reduced wiring system.
Separate the power supply
cable from the power line
and/or high voltage line.
Replace the SI unit with a
new one.
Remedy
Provide grounding to
improve the noise resistance
of the reduced wiring system.
Separate the power supply
cable from the power line
and/or high voltage line.
No.EX##-OMK0004-A