Shielding; General; Bus Cables; Figure 24: Cable Shield At Ground Potential - WAGO 750-626/040-000 Manual

52 Connect Devices
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6.7

Shielding

6.7.1

General

Use of shielded cables reduces electromagnetic interference and thus increases
signal quality. Measurement errors, data transmission errors and interference due
to excessive voltage can be prevented.
Connect the cable shield to the ground potential!
Integrated shielding is mandatory to meet the technical specifications in regards to
measuring accuracy. Connect the cable shield and ground potential at the inlet to
the cabinet or housing. This allows induced interference to dissipate and to be
kept away from devices in the cabinet or housing.

Figure 24: Cable Shield at Ground Potential

Improve shielding performance by placing the shield over a large area!
Higher shielding performance is achieved via low-impedance connection between
shield and ground. For this purpose, connect the shield over a large surface area,
e.g., WAGO shield connecting system. This is especially recommended for large-
scale systems where equalizing current or high impulse-type currents caused by
atmospheric discharge may occur.
Keep data and signal lines away from sources of interference!
Route data and signal lines separately from all high voltage cables and other
sources of high electromagnetic emission (e.g., frequency converter or drives).
6.7.2

Bus Cables

The shielding of the bus line is described in the respective configuration
guidelines and standards of the bus system.
WAGO-I/O-SYSTEM 750 XTR
750-xxxx/0040-xxxx Design Notes /XTR
Manual
Version 1.2.0