Mitsubishi Electric MELSEQ FX3S Series User Manual page 81

FX Series Programmable Controllers
3S
User's Manual - Hardware Edition
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.
WIRING PRECAUTIONS
• 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 wire 2 mm
•
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 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.
9 Input Wiring Procedures
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