SMC Networks LECP1 Series, Operation Manual, Page: 73 / 76

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16. Troubleshooting
Refer to the table below for troubleshooting. When none of the causes in the troubleshooting can be
confirmed and normal operation is recovered by the replacement of a part, it is presumed that failure is
in the product.
Problems with the product may be due to the operating environment (application). Please consult us if
troubleshooting is necessary.
16.1 Operation troubles
Failure
Problem
Possible
causes
Investigation method and the
location of possible causes
Countermeasure
Power
supply
failure
Controller LED(Green) lights up?
Check the supplied voltage and
current for power supply to the
controller.
-->
4. External connection (P.15)
External
equipment
failure
PLC connected to the controller
operates properly?
Check the operation with a test run
of the controller alone.
Refer to the operation manual of the
controller.
-->
6. CN4: Parallel I/O cable (P.19)
Wiring
failure
Check if the wiring is correct.
Refer to the operation manual of the
controller to check wiring, for broken
wires and short-circuits. Correct
wiring and check if the input/output of
each signal is correct.
Prepare separate power supply for CN1
controller input power supply and CN4
input / output signal power supply.
-->
4. External connection (P.15)
-->
6.4 Parallel I/O connector wiring
(Example) (P.22)
Alarm
generated
Controller alarm is generated?
Refer to the operation manual of the
controller. Check the type of alarm.
Refer to the operation manual of the
controller.
-->
12. Alarm detection (P.59)
Unlocking
error
When the unlock switch is turned
ON or OFF there is an unlocking
sound made.
If there is no unlocking sound from the
actuator, a locking failure is possible.
-> If the problem continues to happen,
please contact SMC us.
Does
not
operate
Unsuitable
specification
Check if a product with a suitable
specification was selected.
Reconfirm the combination of the
power supply and the controller and
the actuator in used is correct.
Confirm if the combination of the
actuator part number which is
applicable for the controller and used
actuator is correct.
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2.2 How to Order (P.6)