Mitsubishi Electronics MELSEC-F Manuel D’Utilisation

3 Wiring

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3G

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3U

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3UC

 PLC User's Manual - Analog Control Edition

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3U

-4AD/FX

3UC

-4AD (4-channel Analog Input)

This chapter describes the 4AD wiring.
Observe the following cautions when wiring the 4AD. 

• 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 damages to the product.

• Connect the DC power supply wiring to the dedicated terminals described in this manual.

If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the PLC will be
burnt out.

• Do not wire vacant terminals externally.

Doing so may damage the product.

• Perform class D grounding (grounding resistance: 100

Ω or less) to the grounding terminal on the main unit.

Do not use common grounding with heavy electrical systems.

• 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 of the analog input/output cable at one point on the signal receiving side. 

However, do not use common grounding with heavy electrical systems.

• Make sure to properly wire to the European terminal board in accordance with the following precautions.

Failure to do so may cause electric shock, a short-circuit, wire breakage, or damage to the product.
- The disposal size of the cable end should be 9 mm (0.35").
- Tightening torque should be between 0.22 to 0.25 N

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- Twist the end of strand wire and make sure 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 properly wire the terminal block in accordance with the following precautions.

Failure to do so may cause electric shock, a short-circuit, wire breakage, or damage to the product.
- The disposal size of the cable end should follow the dimensions described in this manual.
- Tightening torque should be between 0.5 and 0.8 N

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