Wiring - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC 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.
WIRING PRECAUTIONS
• Connect the AC power supply to the dedicated terminals specified in this manual.
If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the PLC will burn out.
• Do not wire vacant terminals externally.
Doing so may damage the product.
• Use class D grounding (grounding resistance of 100
However, do not connect the ground terminal at the same point as a heavy electrical system.
• When drilling screw holes or wiring, make sure cutting or wire debris does not enter the ventilation slits.
Failure to do so may cause fire, equipment failures or malfunctions.
• Make sure to observe the following precautions in order to prevent malfunctions under the influence of noise.
- Do not bundle the power line or twisted shielded cable 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, high-voltage line, or load line.
- 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.
• Make sure to properly wire to the terminal blocks 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.
2
or less) with a wire of 2mm or thicker on the grounding terminal of the PLC.
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