SMC Networks PF3W3 Series Operation Manual page 66

Fault Detail
No output
Incorrect
output
Output is
unstable.
Push No reaction
buttons when the
not buttons are
operating. pressed.
Improper
No reaction
operation
to the
of the
external
external
input.
input.
The temp. is
not
Incorrect
displayed.
temp.
sensor
Incorrect
displays.
display
Possible cause
Check if the brown wire DC(+), blue
Incorrect wiring wire DC(-), black wire(OUT1) and white
wire(OUT2) are connected correctly.
Loose connector Check that the connector is connected.
Foreign matter
has entered or got
Confirm whether foreign matter may
stuck inside the
enter.
flow passage of
the sensor.
Piping is Confirm whether the mounting direction
connected in the of the product corresponds to the flow
wrong direction. direction.
Insufficient water
Confirm whether the fluid path is full.
supply
Confirm whether the supply pressure
fluctuates, or whether pulsation is
Pulsation in the
generated due to the characteristics of
flow.
the compressor or pump used as the
pressure source.
Hysteresis value Confirm to what level the hysteresis is
too low. set.
Key-lock mode is Check if "LoC" displayed when the
activated. button is pressed.
Check if the brown wire DC(+), blue
Incorrect wiring wire DC(-), black wire(OUT1) and white
wire(OUT2) are connected correctly.
Confirm whether the input line is
The input duration
connected to GND for a min. of 30
is too short.
msec.
Setting condition
Check the content of the sub screen.
of the sub screen
Connector loose Check that the connector is connected.
Insufficient water
Confirm whether the fluid path is full.
supply
Check if foreign matter is stuck to the
Foreign matter
sensor.
Item to check
-66-
Recommended action
Correct the wiring.
Connect the connector.
We recommend a filter with
filtration of approx. 40
mesh.
Make the mounting
direction correspond to the
flow direction.
Fill up the fluid path.
Change to a pump that has
less pulsation. Install a tank
to reduce the pressure
fluctuation. Change the
piping to elastic piping such
as rubber hose.
Increase the hysteresis set
value.
Chancel the key-lock
function.
(Refer to page 62.)
Correct the wiring.
When the external input is
applied, the input line must
be connected to GND for a
min. of 30 msec.
Set the sub screen to the
temperature display.
Connect the connector.
Fill up the fluid path.
Remove foreign matter.
No.PF※※-OMN0012-I