Mitsubishi Electric FX5U User Manual page 6

[WIRING PRECAUTIONS]
WARNING
● 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, provided 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 or more.
● Make sure to wire the screw terminal block 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.
- Wire terminals 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 6 mm (0.24") or less).
Make sure that the screwdriver does not touch the partition part of the terminal block.
● Make sure to wire 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.
- Wire terminals should follow the dimensions described in the manual.
- Tightening torque should follow the specifications in the manual.
- Twist the ends of stranded wires 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.
[WIRING PRECAUTIONS]
CAUTION
● Do not supply power to the [24+] and [24V] terminals (24 V DC service power supply) on the CPU
module or extension modules. Doing so may cause damage to the product.
● Perform class D grounding (grounding resistance: 100  or less) of the grounding terminal on the
CPU module and extension modules with a wire 2 mm
However, do not use common grounding (refer to Page 78 Grounding) with heavy electrical
systems.
● Connect the 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 cause damage to the product.
● Install module so that excessive force will not be applied to terminal blocks, power connectors, I/O
connectors, communication connectors, or communication cables. Failure to do so may result in wire
damage/breakage or PLC failure.
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or thicker.