15
Safety Precautions
NA-series Programmable Terminal Hardware(-V1) User’s Manual (V125)
The internal power supply of the NA5-W Product uses an isolated DC power sup-
ply, and therefore is not susceptible to the effects of grounding of the 24 V side.
Precaution
Wiring
Observe the following precautions when wiring the NA5-W-V1.
The internal power supply in the NA5-W-V1 is a non-isolated DC power supply. Never
ground the 24 V side. If the 24 V power supply to the NA is grounded positively, a short circuit will
occur as shown below and may result in damage to the device.
24 V Grounding Power Supply
NA5-W-V1 grounding diagram
Internal
non-isolated
power
supply
NA5-W-V1
SG
External
non-isolated
device
SG
24 V
0 V
+
GND
Power
Supply
Grounding
Grounding
Protective ground
Functional ground
Shielded
cable
Hood
PC
USB memory device
Hood
Fuse
Fuse
Non-isolated
power
supply
24 VDC
GND
PE (Protective ground)
Ethernet
connector
hood
Serial
connector
hood
USB slave
connector
hood
USB host
connector
hood
FG (Functional ground)
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