Mitsubishi FX3U Series User Manual page 4

2. WIRING PRECAUTIONS
• Cut off all phases of the power source externally before installation or wiring work in order to avoid electric shock
or damage of product.
• Make sure to attach the terminal cover offered as an accessory to the product before turning on the power or
starting the operation after installation or wiring work.
Failure to do so may cause electric shock.
• Make sure to observe the precautions below in order to prevent any damage to the machine or any accident which
may be caused by abnormal data written to the PLC due to the influence of noise:
1) Do not lay close or bundle with the main circuit line, high-voltage line, or load line.
Otherwise, effects of noise or surge induction are likely to take place.
Keep a safe distance of least 100 mm (3.94") from the above lines during wiring.
2) Ground the shield wire or shield of a shielded cable at one point on the PLC. However, do not ground at the
same point as high voltage lines.
• Observe the following items to wire the lines to the European terminal board. Ignorance of the following items may
cause electric shock, short circuit, disconnection, or damage of the product.
- The disposal size of the cable end should follow the dimensions described in this manual.
- Tightening torque should follow the torque described in this manual.
- Twist the end of strand wire and make sure there is no loose wires.
- Do not solder-plate the electric wire ends.
- Do not connect electric wires of unspecified size or beyond the specified number of electric wires.
- Fix the electric wires so that the terminal block and connected parts of electric wires are not directly stressed.
3. STARTUP AND MAINTENANCE PRECAUTIONS
• Do not touch any terminal while the PLC's power is on.
Doing so may cause electrical shock or malfunctions.
• Before cleaning or retightening terminals, externally cut off all phases of the power supply.
Failure to do so may expose you to shock hazard.
• Before modifying the program under operation or performing operation for forcible output, running or stopping,
carefully read the manual, and sufficiently ensure the safety.
An operation error may damage the machine or cause accidents.
• Do not change programs in the PLC from two or more peripheral equipment (such as the programming tool and
GOT) at the same time.
Such changes may cause destruction or malfunction of programs in the PLC.
• Do not disassemble or modify the PLC.
Doing so may cause failures, malfunctions or fire.
For repair, contact your local Mitsubishi Electric distributor.
• Before connecting or disconnecting any extension cable, turn off power.
Failure to do so may cause unit failure or malfunctions.
• Make sure to turn off the power before attaching or removing the peripheral equipment, expansion board, special
adaptor, or function extension memory cassette.
Failure to do so may cause device failure or malfunctions.
Safety Precautions
(Read these precautions before use.)
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