Omron V440-F User Manual page 226

A-2 Grounding and Power
A-2-1 Ground and Shield Considerations
Proper grounding is necessary for operator safety, noise reduction, and the protection of equipment from voltage
transients. Buildings, including any steelwork, all circuits, and all junction boxes must be grounded directly to an
earth ground in compliance with local and national electrical codes.
POWER
SUPPLY
+
-
SHIELD
Chassis
An earth ground is provided through the cable shields and chassis of the camera.
If the MicroHAWK malfunctions due to influence of the environment by shield cables grounded, try any of the
ones below.
• Disconnect the chassis and the shield cable of the power supply from the earth.
• Ground the shield cable of the power supply to –(0V).
Ground any of one part of the shield cable, chassis, or RJ-45 connector of Ethernet cable to earth with D class
grounding. Use a Class 2 power supply for the DC source.
Note: In the case of this connection, must not ground the +(24V) of the power supply. If connected, the device
will break down due to a short circuit.
A-2-2 Ground Loops
Ground loops (signal degradation due to different ground potentials in communicating devices) can be eliminated or
minimized by ensuring that both the host, imager, and their power supplies are connected to a common earth ground.
Note: If a malfunction occurred to your reader by noise, mount a noise filter (RSAL2001W manufactured by
TDK-Lambda Corp.) close to the reader's power-supply terminals and ground the chassis of the filter.
V440-F C-Mount Code Reader User Manual
Ethernet Device
V440-F
+ -
SHIELD Ethernet
ISOLATION
SHIELD
NON-
ISOLATION SHIELD
SHIELD
ISOLATION SHIELD I/O
SHIELD
MACHINE
RJ45 connector
RS232/422/485
Device
RS232/422/485
Appendices
A
A-5