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5 Installation
CJ2 CPU Unit Hardware User’s Manual
5-4 Control Panel Installation
5
5-4-5 Electrical Environment
• To avoid overheating the conduits when using conduits for wiring, do not place wires for a single
circuit in separate conduits.
• Power cables and signal cables adversely affect each other. Do not wire them in parallel.
• Noise induction may occur if the PLC is installed in a panel that includes high-voltage devices.
Whenever possible, wire and install them separately. (Refer to PLC Installation Location on page
42.)
• Either install the PLC a minimum of 200 mm from high-voltage lines or power lines, or place the
high-voltage lines or power lines in metal tubing and completely ground the metal tubing to 100 Ω
or less.
z Other Precautions
• Basic I/O Units have both plus and minus commons, so pay attention to the polarity when wiring.
• Optical fiber cable looks like ordinary communications cable or power cable, but internally it con-
sists of fibers, tension members, other protective materials. It must be handled with care. In partic-
ular, optical fiber cable must be installed according to prescribed methods and standards. Do not
subject optical fiber cable to severe tensile shock, excessive bending, twisting, or excessive con-
striction. For details on wiring optical fiber cables, refer to the following manuals.
• SYSMAC H-PCF Optical Fiber Cables Installation Guide (Cat. No. W156)
• Optical Ring Controller Link Units Operation Manual (Cat. No. W370)
Parallel Wiring (Single Phase)
Correct
Correct
Power supply
Incorrect
Power supply
Power supply
Load
Load
Load
Example: Separating PLC from Power Lines
PLC
Metal tubing
PLC
200 mm
200 mm
Panel with power line
Power line
Ground of 100 Ω or less
Power line
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