SMC Networks D-S7 Series, Operation Manual

Page: 18 / 26

-17-
No.D-
※
S-OMB0023-B
Reference
No.
Problem Possible cause Investigation method Countermeasure
5
Output stays
OFF
Display stays
OFF
Abnormal power
source
Check the source voltage.
(Zero or very low)
Set the source voltage to specified voltage.
(Refer to "Specifications (power voltage
and load voltage)" on page 19 .)
Wiring failure
Voltage applied to switch
(load voltage).
Correct wiring.
(Refer to "Circuit diagram" on page 14 .)
Incorrect setting
(mounting)
position
Check if detection is made close to the
operation range limit.
Correct the position.
(Center of operation range)
Set position
displacement
Loose set bracket or set screw.
Fix at the right position with right torque.
Tightening torque: 0.5 Nm
Stop position
displacement of
the piston
Check if the stroke stop position is
Inconsistent.
Stabilize stop position.
(Correction of displacement/cushion)
Decrease of
Detected
magnetic field
(demagnetization)
Presence of magnetic field generating
source around the cylinder.
(Electric welding machine conductor/
Strong magnet)
Use the shield between magnetic field
generating source and cylinder.
Influence of magnetic field of adjacent
cylinder (20 mm or less).
Keeps cylinder away (40 mm or more).
Use magnetic shielding.
Presence of magnetic material (chip) piled
up on the cylinder.
Remove piled up magnetic material.
Lead wire
disconnected
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)
6
Output stays
OFF
Display is
normal
Not match with
load specification
(2-wire type)
Check if load specification satisfy the
formula below.
Load ON voltage
< Load voltage
–
(Switch internal voltage drop x n)
n: Number of switch connected in serial
Change to 3-wire type or reed Auto
switch.
Reduce the number of switch connected
in serial.
Wiring failure
(Output line)
(3-wire type)
Connect condition
(connector contact pin / crimp terminal).
Correct wiring.
(Re-wiring the connecting part)
Disconnection of
lead wire (black)
(3-wire type)
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)