CAUTION
When you connect a computer or other peripheral device to a Controller that has a
non-isolated DC power supply
, either ground the 0-V side of the external power supply
for the Unit power supply or do not ground it at all.
If the peripheral devices are grounded incorrectly
, the external power supply for the
Unit power supply may be short-circuited. Never ground the 24-V side of the power
supply, as shown in the following figure.
Internal
power supply
circuit
(No-isola-
tion)
CPU Unit
Cable
External device
(e.g. computer)
External power supply (Unit power supply)
Non-isolated type Communications Interface Unit, etc.
Unit power
supply
terminals
Non-isolated DC
power supply
Units with Ground Terminals and Type of Ground Terminals
CPU Unit,
NX Unit
Functional Grounding
l
Units with Ground Terminals
• CPU Unit
• Additional NX Unit Power Supply Unit
•
Shield Connection Unit
5 Installation and Wiring
5-38
NX-series NX502 CPU Unit Hardware User's Manual (W629)
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