Wiring; Grounding - Mitsubishi Electric FX3U-ENET-ADP User Manual

FX -ENET-ADP User's Manual
3U
5.

Wiring

WIRING PRECAUTIONS
• Make sure to cut off all phases of the power supply externally before attempting wiring work.
Failure to do so may cause electric shock or damage to the product.
WIRING PRECAUTIONS
• Perform class D grounding (grounding resistance: 100
cross-sectional area 0.5 to 1.5 mm
• When drilling screw holes or wiring, make sure that cutting and wiring debris do not enter the ventilation slits.
Failure to do so may cause fire, equipment failures or malfunctions.
• Make sure to properly wire to the terminal block (European type) in accordance with the following precautions.
Failure to do so may cause electric shock, equipment failures, a short-circuit, wire breakage, malfunctions, or damage to the product.
- The disposal size of the cable end should follow the dimensions described in the manual.
- Tightening torque should follow the specifications in the manual.
- Twist the end of strand wire and make sure that there are no loose wires.
- Do not solder-plate the electric wire ends.
- Do not connect more than the specified number of wires or electric wires of unspecified size.
- Affix the electric wires so that neither the terminal block nor the connected parts are directly stressed.
• Make sure to observe the following precautions in order to prevent any damage to the machinery or accidents due to abnormal data
written to the PLC under the influence of noise:
1) Do not bundle the main circuit line together with or lay it close to the main circuit, high-voltage line or load line.
Otherwise, noise disturbance and/or surge induction are likely to take place. As a guideline, lay the control line at least 100mm
(3.94") or more away from the main circuit or high-voltage lines.
2) Ground the shield wire or shield of the shielded cable at one point on the PLC. However, do not use common grounding with
heavy electrical systems.
5.1

Grounding

Ground the cables as follows
• The grounding resistance should be 100
• Independent grounding should be established whenever possible.
Independent grounding should be performed for best results.
When independent grounding is not configured, perform "shared grounding" as shown in the following
figure.
For details, refer to the respective PLC manual.
Other
PLC
equipment
Independent grounding
Best
• The grounding point should be close to the Ethernet adapter, and all grounding wires should be as short as
possible.
Terminal block arrangement
Terminal name
(Ground terminal)
or less) to the grounding terminal on the FX
2
. Do not use common grounding with heavy electrical systems (refer to the Section 5.1).
or less.
Other
PLC
equipment
Shared grounding
Good
Content
Perform class D grounding.
(Grounding resistance: 100 or less)
→ Refer to FX
→ Refer to FX
Other
PLC
equipment
Common grounding
Not allowed
5 Wiring
5.1 Grounding
-ENET-ADP with a wire of
3U
Hardware Edition
3U
Hardware Edition
3UC
29
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A