SMC Networks D-M7BA Series Operation Manual page 15

Trouble
Trouble
No.
Output stays Not match with
OFF load
5
Display is specification
normal (2-wire type)
Incorrect setting
(mounting)
position
Set position
displacement
Wiring failure
Unstable
operation
(Chattering)
Lead wire
disconnection
6
Malfunction due
to turbulence
magnetic field
Malfunction due
Multiple point
to turbulence
operation
magnetic field
Detect the
Load does not intermediate
operate position of the
stroke
Possible cause Investigation to find possible cause
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
Check if detection is made around
the limit of operation range.
Loose set bracket or set screw.
Condition of connecting part
(connector contact pin/crimp
terminal).
Presence of repeated bending
stress to one point of the lead wire.
(Bend radius/Tensile force to lead
wire)
Presence of magnetic field
generating source around the
cylinder.
(Cylinder, electric welding machine
conductor, motor, magnet etc.)
Influence of the magnetic field of
adjacent cylinder.
Check if piston speed satisfy the
formula below.
Load operation time [s]
< Switch operation time [mm]
/piston speed [mm/s]
Reduce the number of switch
connected in serial.
Correct the position.
(center of the operation range.)
Fix at the right position with right torque.
Tightening torque: 0.05 to 0.1 N•m
Correct wiring.
(Re-wiring of connecting part)
Correct wiring.
(Correct tensile force/increase bend
radius)
Use the shield between magnetic field
generating source and cylinder.
Keep the cylinder away from magnetic
field generating source.
Use magnetic shield between
cylinders.
Reduce the piston speed until the
formula is satisfied.
-14-
Countermeasure
No.D-※S-OMZ0004