SMC Networks D-S7 Series, Operation Manual

Page: 17 / 26

-16-
No.D-
※
S-OMB0023-B

Cross-reference for troubleshooting
Reference
No.
Problem Possible cause Investigation method Countermeasure
1
Output ON
and OFF is
displayed in
turn
Wiring failure
Check that the load is connected.
Correct wiring.
(Refer to "Circuit diagram" on page 14 .)
Not match with
load specification
Check if load specification satisfy the
formula below.
Load current

40 mA
Change to a load which satisfies the
formula.
Lead wire
disconnection
Presence of repeated bending stress to
one point of the lead wire.
(Bend radius/Tensile force to lead wire)
Correct wiring.
(Correct tensile force/increase bend
radius)
2
Output stays
ON
Display stays
ON
Malfunction due to
turbulence
magnetic field
Influence of the magnetic field of adjacent
cylinder.
Use magnetic shield between cylinders.
Incorrect setting
(mounting)
position

: Short stroke
Check if the condition is as below.
Switch operation range.
> Piston stroke
Displace the switch set position from the
operation range center.
3
Output stays
ON
Display stays
OFF
Wiring failure
(2-wire type)
Check if the switch wiring connection is
reversed (Brown/Blue).
Correct wiring.
(Refer to "Circuit diagram" on page 14 .)
Switch failure
(3-wire type)
Replace the switch.
4
Output stays
ON
Display is
normal
Not match with
load specification
(2-wire type)
Check if load specification satisfy the
formula below.
Load ON voltage
> (Switch leak current x n)
x Load resistance or load OFF current
> (Switch leak current x n)
n: Number of switch connected in parallel
Change to 3-wire type or reed Auto
switch.
Reduce the number of switch connected
in parallel.
Wiring failure
(3-wire type)
Check reversed connection of the switch
wiring (Black/Blue).
Correct wiring.
(Refer to "Circuit diagram" on page 14 .)