4 Installation and Wiring
4-52
NJ-series CPU Unit Hardware User’s Manual (W500)
When installing or wiring devices, make sure that there will be no danger to people and that noise will
not interfere with electrical signals.
Install the Controller as far away as possible from high-voltage (600 V or higher) and power devices to
ensure safe operation and maintenance.
Observe the following points.
• Place a Unit that does not generate much noise next to the CPU Unit, such as an Input Unit or Com-
munications Unit.
• The coils and contacts in electromagnetic contactors and relays in an external circuit are sources of
noise. Do not install them close to the Controller. Locate them at least 100 mm away from the Con-
troller.
4-5-5 Electrical Environment
Controller Installation Location
Arrangement of Controller and Units
Example of Recommended Equipment Arrangement
Controller
Control panel Control panel High-voltage
power panel
Examples of Equipment Arrangement in Panel with High-voltage Devices
Example of Poor Equipment Arrangement
Controller
Control panel Control panel High-voltage
power panel
OK
NG
Power Supply Unit
Communications Unit
CPU
DC Unit
DC Unit
AC Unit
AC Unit
DC I/O
device
AC I/O
device
Terminal block
Example of Arrangement in Panel
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