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I
6. LOADING AND INSTALLATION
MELSEC-A
(3)
Grounding
(a) The A series PC has good noise resistance. herefore, the PC may
be used without grounding except when there is excessive noise.
However, follow (b) to (e) described below.
(b) Ground the PC as independently as possible. Class 3 grounding
should be used (grounding resistance 100
Q
or less).
(c) When independent grounding is impossible, use the joint ground.
ing method as shown in the figure below (2).
PC
Other
equipment
-
L
-
-
PC
Other
equipment
(1) Independentgrounding:Best
(2) Joint grounding: Good
(3) Jointgrounding: Not allowed
(d) Use 2 mm
2
(14 AWG) or thicker grounding wire. Grounding point
should be as near as possible to the PC to minimize the distance of
grounding cable.
(e) Should incorrect operation occur due to grounding, disconnect one
of both of the LG and FG terminals of base units from the grounding.
6-7

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