Maintenance - SMC Networks EX12 SCS Series Operation Manual

Maintenance

Mounting/Wiring
Item to inspect
Check the SI unit terminal for the
communication and the power supply are
connected correctly.
Confirm that a terminating resistor is
correctly connected to both ends of the
network.
Confirm that the connection cable is not
broken.
Disposables
Item to inspect
Special flat ribbon cable
VCTF cable
SI unit
Power supply
Item to inspect
Measure the voltage of the power supply for
communication and check if the voltage is
within the specified range.
Measure the voltage of the power supply for
the solenoid valve and check if the voltage
is within the specified range.
Criteria
Not loose.
Terminating resistor should
be connected correctly.
No problem in the
appearance.
Criteria
No problem is found in the
appearance or the
conductor resistance value.
No abnormality of the
operating condition and the
display.
Criteria
14 to 26.4 VDC
24 VDC +10%/-5%
-17-
Countermeasure
Perform extra tightening.
(Refer to Mounting and Installation.)
Connect terminating resistors which are
suitable for the cable.
(Refer to Mounting and Installation.)
If any problem is confirmed from the
appearance, replace the cable.
Countermeasure
If any visible problem is found or the
conductor resistance value is not normal,
replace the cable.
Please refer to the specification of the
cable for the conductor resistance.
Replace the unit if the unintended
operation or abnormality is confirmed on
the display.
Countermeasure
Investigate the cause of voltage
fluctuation and fix the problem.
Investigate the cause of voltage
fluctuation and fix the problem.
No.EX※※-OMC0002-C