Troubleshooting - SMC Networks PF3A703H-L Operation Manual

Troubleshooting

If an operation failure of the product occurs, please confirm the cause of the troubles from the following table.
If a cause applicable to the troubles cannot be identified and normal operation can be recovered by
replacement with a new product, this indicates that the product itself was faulty. Problems with the product
may be due to the operating environment (installation etc). Please consult SMC.
●Cross-reference for troubleshooting
Problem Possible
Error indication
•
The Auto switch
output does not
turn off.
Incorrect flow rate
The indicator light
setting
stays ON
•
The switch output
does not turn on
Operation LED
Product failure
stays OFF
The output does
Incorrect wiring
not turn off.
Indicator light is
normal
Product failure
Incorrect wiring
The output does
Model Selection
not turn on.
Indicator light is
normal
Lead wire broken
Product failure
Incorrect wiring
The switch output
generates
chattering.
Incorrect flow rate
setting
Product failure
Investigation method
causes
(1) Check the flow rate setting.
(2) Check the settings of the operation
mode, hysteresis and output type.
(in hysteresis mode or window
comparator mode, and normal
output/ reversed output)
Check the output wiring.
Check if the load is directly connected to
DC(+) or DC(-).
Check the output wiring.
Check if the load is directly connected to
DC(+) or DC(-).
Check if PNP output is used when NPN
should have been selected, or the other
way around.
Check if there is bending stress applied
to any part of the lead wire.
(bending radius, tensile force to the lead
wire)
Check the wiring.
Check if the brown and blue wires are
connected to DC(+) and DC(-)
respectively, and if the output line is
secure (contact failure).
(1) Check the flow rate setting.
(2) Check if the tolerance range is small.
-85-
Countermeasure
(1) Adjust the set flow rate.
(2) Change the response time
setting.
Replace the product
Check and correct the wiring.
Replace the product
Check and correct the wiring.
Revise the model selection
(output specification).
Correct the wiring.
(Reduce the tensile force or
increase the bending radius.)
Replace the product
Correct the connection on the
power cord and the plug.
(1) Adjust the set flow rate.
(2) Make the tolerance wider.
Replace the product
No.PF※※-OMX0002