Cables - Mitsubishi Electric SW0DNC-MNETH-B User Manual

5 EMC AND LOW VOLTAGE DIRECTIVE

5.1.3 Cables

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Use a shielded cable for the cable extended out of the control panel.
If a shielded cable is not used or not grounded correctly, the noise immunity will not
meet the required value.
(1) Grounding a shield cable
(a) Ground the shield of the shield cable as near the exit as possible from the
control panel.
If the ground point is not near the outlet, the cables after the ground point
will cause electromagnetic induction, and will generate a higher harmonic
noise.
(b) Ground the exposed shield to large area on the control panel. A clamp fitting
can be used as shown below.
In this case, mask off the inner wall surface of the control panel, where
comes in contact with the fitting.
Paint mask
POINT
Grounding with a vinyl-coated wire soldered onto the shield of the shielded cable as
shown below is not recommended.
Doing so will raise the high-frequency impedance, resulting in loss of the shielding
effect.
(2) Treatment of the coaxial cable ground
(a) Always use a double-shielded coaxial cable (MITSUBISHI CABLE : 5C-2V-
CCY) for the coaxial cables Q80BD-J71BR11. Ground the double-shielded
coaxial cable by connecting its outer shield to the ground.
Refer to (1) for the grounding of the shield.
Shield
(b) Make sure to install a ferrite core for the cable.
Screw
Clamp fitting
Shielded cable
Shielded cable
Wire
Crimp terminal
Ground here
MELSEC
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