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) Jointgrounding: 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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