Grounding - Omron Programmable Terminals NT31 NT31C Setup Manual

Installation

3-1-4 Grounding

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The NT31/NT31C has a functional ground terminal (
Carry out wiring under the following conditions.
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 (
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.
NT31/
NT31C
Note Carry out grounding correctly in order to prevent operating errors due to noise.
Host
Ground to
100 Ω max.
Fig. (a)
Section
).
) of the
NT31/
Host
NT31C
Grounding at
a single point
Fig. (b)
3-1