Mitsubishi Electric MELSEQ FX3S Series User Manual page 5

4. WIRING PRECAUTIONS
• Make sure to cut off all phases of the power supply externally before attempting installation or wiring work.
Failure to do so may cause electric shock or damage to the product.
• Make sure to attach the terminal cover, offered as an accessory, before turning on the power or initiating operation
after installation or wiring work.
Failure to do so may cause electric shock.
• The temperature rating of the cable should be 80°C or more.
• Do not supply power to the [24V] terminal (24 V DC service power supply) on the main unit.
Doing so may cause damage to the product.
• Perform class D grounding (grounding resistance: 100 Ω or less) to the grounding terminal on the main unit with a
2
wire 2 mm or thicker.
Do not use common grounding with heavy electrical systems (refer to Section 8.3).
• Connect the AC 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 burn
out.
• Noise resistance may be lower when the L and N wires of an AC power supply are not wired correctly.
Please wire using the correct polarity.
• 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 burn
out.
• Do not wire vacant terminals externally.
Doing so may damage the product.
• 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 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 power line or shield of the analog input/output 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 100 mm (3.94") or more away from the main circuit, high-voltage line, or load line.
2) 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 main unit 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.
- Make sure to properly wire to the main unit in accordance with the rated voltage, current, and frequency of each
terminal.
- The disposal size of the cable end should follow the dimensions described in the manual.
- Tightening torque should follow the specifications in the manual.
- Tighten the screws using a Phillips-head screwdriver No.2 (shaft diameter 6mm (0.24") or less). Make sure that
the screwdriver does not touch the partition part of the terminal block.
• 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.
Safety Precautions
(Read these precautions before use.)
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Reference
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65
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98
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Reference
52
65
75
98
109
112
116
117
119