Mitsubishi Electric Q80BD-J61BT11N, User Manual

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App - 88 App - 88
MELSEC
APPENDIX
(3) Cables
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.
(a) Grounding of shielded of shield cable

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.

Peel part of the shielded cable's sheath, and ground a wide section of the
exposed shielded section against the control panel.
Clamp fittings can be used as shown below. Note that the painting on the
inner side of the control panel, against which the clamp fitting is contacted,
must be masked.
Screw
Clamp fitting
Shielded cable
Paint mask
POINT
The method of grounding by soldering a wire onto the shield section of the shielded
cable as shown below is not recommended. The high frequency impedance will
increase and the shield will be ineffective.
Shielded cable
Wire
Crimp terminal