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4 Installation and Wiring
NJ-series CPU Unit Hardware User’s Manual (W500)
4-5 Control Panel Installation
4
4-5-5 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 Controller is installed in a panel that includes high-voltage
devices. Wire and install them as far apart as possible. (Refer to Controller Installation Location
on page 4-52.)
• Either install the Controller a minimum of 200 mm away 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 or less.
Other Precautions
• Basic I/O Units have both plus and minus commons, so pay attention to the polarity when wiring.
Parallel Wiring (Single Phase)
Correct
Correct
Power supply
Incorrect
Power supply
Power supply
Load
Load
Load
Example: Separating Controller from Power Lines
Controller
Metal tubing
Controller
200 mm
200 mm
High-voltage power panel
Power line
Ground of 100 Ω or less
Power line
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