jWlRING
I
IGrounding
I
Grounding should be done according to the following.
1.
Ground the PLC as independently as possible. Class
3
grounding should be
used (grounding resistance
100
Q
or
less).
2.
When independent grounding
is
not possible, use the joint grounding
method as shown below.
Class
3
grounding
(Best)
Class
3
grounding
(Goodt)
Joint grounding
(Not
allowed)
3.
In the case
of
incorrect operation due to grounding, disconnect one or both
of
the LG. and FG terminals
of
the base units
from
the grounding.
56
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