Grounding - Mitsubishi MELSEC A1SCPU Handy Manual

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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.
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