<5. Wiring>
5-7
IM 01W03D01-01EN
5.5 Grounding
Class D grounding with the grounding resistance
of 100Ω or less is necessary. To connect the
grounding cable to FN310 directly, use the ground
terminal on the top of the housing. Do not share the
ground wiring with other devices.
Applicable Cables
Insulated cables for industrial equipment such as;
• 600V polyvinyl chloride insulated wires (IV); JIS
C3307
• Polyvinyl chloride insulated wires for electrical
apparatus (KIV); JIS C3316
• 600V grade heat-resistant polyvinyl chloride
insulated wires (HIV); JIS C3317
• Heatproof vinyl insulated wires VW-1 (UL1015/
UL1007)
Wire size
• Core: AWG14 to 13 (2mm
2
to 2.6mm
2
)
Termination
• Use a ring tongue terminal for M4 terminals:
with an insulation sleeve
Ground Wiring
Connect the grounding cable to ground terminal on
the top of the housing.
Grounding terminal
F0517.ai
Figure 5.13 Grounding Terminal
CAUTION
Grounding is required for safe operation.
Input Cable Wiring
The input cable shield should be connected to
grounding terminal inside of the housing.
• The input cable shield should not be connected
to grounding terminal inside of the HART
device.
• Connection to the ground terminal of HART
device housing, refer to the User's Manual.
Grounding When Connecting to the 4-20 mA
Loop
When using junction box, connect the shield wire
of the input cable and 4-20 mA loop cable. In order
to avoid the multi point grounding, do not connect
the grounding terminal inside of the housing when
grounded in the 4-20 mA loop side. Otherwise,
connect the shield wire to grounding terminal inside
of the housing.
