Wiring The Additional Power Supply Units - Omron NX Series User Manual

4-4 Wiring the Additional Power Supply
Units
This section describes how to wire the terminals on the Additional Power Supply Units.
Make sure that the voltages and currents that are input to the Units and slaves are within the speci-
fied ranges.
Inputting voltages or currents that are outside of the specified ranges may cause accidents or fire.
Precautions for using non-isolated power supply
When you connect a computer or other peripheral device to any of the following NX Units, ground
the 0 V side of an external power supply (Unit power supply) or do not ground it at all.
• Communications Coupler Unit with non-isolated type internal power supply circuits
• Communications Coupler Unit that is connected to a non-isolated type Additional NX Unit Power
Supply Unit
Depending on how the peripheral device is grounded, the external power supply (Unit power sup-
ply) may be shorted. Never ground the 24 V side of the power supply as shown in the figure below.
<Grounding that causes a 24-V power supply to short>
Peripheral
device
(e.g. computer)
NX-series System Unit User's Manual (W523)
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WARNING
Caution
Communications Coupler Unit
No-isolation DC
power supply
(internal power
supply circuit)
Peripheral
cable
Ground
terminal
24 V
4 Installation and Wiring
NX bus power supply
0 V
Unit power supply
4
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