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3-1SectionInstallation
34
3-1-4 Grounding
The NT31/NT31C has a functional ground terminal ( ).
Carry out wiring under the following conditions.
1, 2, 3... 1. In cases where the distance between the NT31/NT31C is small and it is as-
sumed that there is no potential difference between grounds, ground as
shown in Fig. (a) below.
2. In cases where there is a potential difference between the grounds of the
NT31/NT31C and the host, ground as shown in Fig. (b). If there is some dis-
tance between the NT31/NT31C and host and grounding at a single point is
difficult, do not connect the functional ground terminal (
) of the
NT31/NT31C.
3. If the NT31/NT31C is installed in the same panel as equipment that gener-
ates noise, such as a motor or inverter, do not ground the functional ground
terminal (
) of the NT31/NT31C.
Fig. (a) Fig. (b)
Ground to
100 Ω max.
Grounding at
a single point
NT31/
NT31C
Host
NT31/
NT31C
Host
Note Carry out grounding correctly in order to prevent operating errors due to noise.