40
System Description
WAGO-I/O-SYSTEM 750
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
Pos: 17.13.42 /Serie 750 (WAGO-I/O-SYSTEM)/Systembeschreibung/Versorgung/Schirmung @ 3\mod_1231251994828_21.doc @ 25813 @ 23333 @ 1
3.8
Shielding (Screening)
3.8.1
General
The shielding of the data and signal conductors reduces electromagnetic
interferences thereby increasing the signal quality. Measurement errors, data
transmission errors and even disturbances caused by overvoltage can be avoided.
Note
Lay the shielding throughout the entrance and over a wide area!
Constant shielding is absolutely required in order to ensure the technical
specifications in terms of the measurement accuracy.
The cable shield should be potential. With this, incoming disturbances can be
easily diverted.
You should place shielding over the entrance of the cabinet or housing in order to
already repel disturbances at the entrance.
Note
Lay high-voltage cables separately!
Separate the data and signal conductors from all high-voltage cables.
3.8.2
Bus Conductors
The shielding of the bus conductor is described in the relevant assembly
guidelines and standards of the bus system.
3.8.3
Signal Conductors
Bus modules for most analog signals along with many of the interface bus
modules include a connection for the shield.
Note
Improve shield performance by placing the shield over a large area!
For a better shield performance, you should place the shield previously over a
large area. The WAGO shield connection system is suggested for such an
application. This suggestion is especially applicable if the equipment can have
even current or high impulse formed currents running through (for example
initiated by atmospheric discharge).
