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<4.
Wiring and Piping
>
4-4
IM 21B03D01-01E
4.2.3 Grounding
(1) Provide grounding with a ground resistance of
100Ω.
(2) Grounding terminals are provided inside and
outside of the terminal box. Use either terminal.
(3) Use 600V PVC insulated wire for grounding
wiring.
4.3 Intrinsically Safe Type Wiring
The wiring of the intrinsically safe circuit between
the converter and the safety barrier must be kept
routed with sufficient physical separation from other
circuits so as not to be affected by electromagnetic
induction, etc., and should be implemented using
metallic conduit or shielded cable.
F0404.ai
G
Current
signal
+
–
Ground
Figure 4.4
Wiring
Single-loop controller
Supply air pressure
Stop valve
Air filter
Reducing
valve
Pressure
gauge
Non-
hazardous
area
Hazardous
area
+
–
PK200 current-to-
pneumatic converter
Control valve
F0405.ai
Safety barrier
Figure 4.5
Intrinsically Safe Type Wiring
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