Control Panel Installation; Temperature - Omron NX Series User Manual

4 Installation and Wiring
• Use an isolating transformer to significantly reduce noise between the Controller and the ground. In-
stall the isolating transformer between the Controller power supply and the noise filter, and do not
ground the secondary coil of the transformer.
• Keep the wiring between the transformer and the Controller as short as possible, twist the wires
well, and keep the wiring separate from high-voltage and power lines.
Power Supply System Diagram
Wiring External I/O Signal Lines
Observe the following points when wiring external I/O signal lines.
• To absorb reverse electromotive force when an inductive load is connected to an output signal, con-
nect a surge suppressor near the inductive load in an AC circuit, or connect a diode near the induc-
tive load in a DC circuit.
Inductive
load
Connect a diode in a DC circuit.
Input Signal Noise Countermeasures
• Never bundle output signal lines with high-voltage or power lines, and do not route them in close
proximity or parallel to such lines.
If output signal lines must be routed in close proximity to such lines, place them in separate ducts or
conduits. Be sure to ground the ducts or conduits.
I/O cables
Power lines
Suspended ducts
4-40
Power circuits
Power supply for general operations circuits
I/O power supply for Controller
I/O power supply for Controller
Noise
Unit power supply for Controller
filter
Outlet (for peripheral devices)
DC
Input
Diode Unit
Output
Unit
Connect a surge
suppressor in an AC circuit.
I/O cables Power lines
I/O cables
Floor ducts
I/O Cable Arrangement
Surge
suppressor
Inductive
load
Output
Unit
Connect a diode
in a DC circuit.
Output Signal Noise Countermeasures
Power lines
Conduits
NX-series CPU Unit Hardware User's Manual (W535)
Inductive Diode
load