Parallel Wiring (Single Phase); Other Precautions; Example: Separating Controller From Power Lines - Omron NJ501-1 Series User Manual

• 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.
NJ-series CPU Unit Hardware User's Manual (W500)
Power supply
Incorrect
Power supply
Correct
Power supply
Correct

Parallel Wiring (Single Phase)

High-voltage power panel
Power line
Power line
200 mm
Controller
200 mm

Example: Separating Controller from Power Lines

4 Installation and Wiring
Load
Load
Load
Metal tubing
Controller
Ground of 100 Ω or less
4
4-55