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MELSEC-Q
8 EMC AND LOW VOLTAGE DIRECTIVE
8.1.4 Power supply module
Always ground the LG and FG terminals after short-circuiting them.
8.1.5 When using QA1S6 B type base unit
(1) Cable
(a) Earthing of shielded cable
• Earth the shield of the shielded cable as near the unit as possible taking
care so that the earthed cables are not induced electromagnetically by the
cable to be earthed.
• Take appropriate measures so the shield that was partly removed for
exposure is earthed to the control panel over a large contact surface area.
A clamp may also be used as shown in the figure below. In this case,
however, apply a cover to the painted inner wall surface of the control
panel which comes in contact with the clamp.
Shield section
Screw
Clamp fittin
g
Shielded cable
Paint mask
Note) The method of earthing 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