SMC Networks D-MH1AD Series Operation Manual page 70

Problem
Phenomenon
No.
The display is
7
unstable.
•The display
turns off.
•Part of the
8
display is
missing.
9 Display flashes
Buttons do not
10
work
The operation is
11 unstable
(chattering)
Problem
Possible causes
Incorrect Check if the power supply voltage is
power supply in the range 12 to 24 VDC ±10%.
Check the power supply wiring.
Check if the brown and blue wires are
Incorrect wiring
connected to DC (+) and DC (−)
respectively, and if the wiring is secure.
Deformation of
the workpiece
itself; deflection
Check if there is any change in the
of the chuck;
ambient temperature or mounting
fluctuations in the
orientation.
ambient
Check if the deflection in the
temperature;
workpiece or chuck is acceptable.
changes in the
mounting
orientation
Incorrect Check if the power supply voltage is
power supply in the range 12 to 24 VDC ±10%.
Check the power supply wiring.
Check if the brown and blue wires are
Incorrect wiring
connected to DC (+) and DC (−)
respectively, and if the wiring is secure.
Power saving Check if power saving mode is
mode selected.
Product failure
(1) Check the power supply wiring.
(2) Check if there is bending stress
Incorrect wiring
applied to any part of the lead
wire.
Key-lock mode is Check if the key-lock function is
activated. turned on.
Product failure
Affected by the
fluctuations in the
ambient
(1) Check the operating range setting
environment
(hysteresis).
because of a too
(2) Check the delay time.
small hysteresis
or too short switch
delay time.
(1) Check the power supply wiring.
(2) Check if there is bending stress
Poor wiring or applied to any part of the lead
broken lead wire wire.
(bending radius, tensile force to
the lead wire)
Product failure
-69-
Investigation method Countermeasures
Supply power in the range
12 to 24 VDC ±10%.
Check and correct the
wiring.
If the fluctuation is not
acceptable, the number of
digits (display sensitivity)
can be reduced by changing
the display resolution.
A digital filter setting may
also improve the condition.
Supply power in the range
12 to 24 VDC ±10%.
Check and correct the
wiring.
Set up the function again.
Replace the product.
(1) Check and correct the
wiring.
(2) Correct the wiring (bend
radius and stress).
De-activate key-lock mode.
Replace the product.
(1) Check the operating
range setting.
(2) Set up the function again.
(1) Check and correct the
wiring.
(2) Modify the wiring.
(Correct the tensile force
and increase the bending
radius)
Replace the product.
No.D-※S-OMA1021