Omron sysmac NA Series User Manual page 16

Safety Precautions
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
Power
Supply
Protective ground
Functional ground
Grounding
NA5-W-V1 grounding diagram
Non-isolated
power
supply
24 VDC
GND
Additional Information
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.
14
WARNING
NA5- W
Internal
24 V +
Fuse
non-isolated
power
supply
GND
0 V
Fuse
Grounding
Serial
connector
hood
Ethernet
connector
hood
PE (Protective ground)
FG (Functional ground)
-V1
Shielded
cable
SG SG
Hood Hood
USB slave
connector
hood
USB host
connector
hood
NA-series Ladder Monitor User's Manual (V124)
External
non-isolated
device
PC
USB memory device