Shielding; Connection Of Shielding; Examples Of Shielding Connections - Bartec POLARIS PROFESSIONAL B7-72V1 Series User Manual

Installation
5.8.4

Shielding

5.8.5

Connection of shielding

5.8.6

Examples of Shielding Connections

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POLARIS PROFESSIONAL
POLARIS Panel PC Professional 15" up to 24"
- Only cables with braided shielding should be used (recommended cover density
> 80 %).
- Sheet shielding should not be used.
- Generally, connection of the shielding at both ends results in optimum damping of all
interference frequencies.
- Connection of the shielding at one side only may be more advisable if a difference in
potential exists and no equipotential bonding cable can be laid.
A low impedance connection to the circuit protective conductor is important to ensure a low
current fault path. When sub-D connectors are used, the shielding should always be
connected to the metal casing of the sub-D plug.
The plug casing of some controllers is not always well connected to earth. In such cases it
may prove advantageous to insulate the shielding from the sub-D plug of the controller and
connect it directly to the protective earth conductor by means of a cable that should be kept
as short as possible (0.75 mm² ... 1.5 mm²).
Double-sided shield connection on the connecting cables:
Illustration 15: Example of double-sided shield connection
Generally, connection of the shielding at both ends results in optimum damping of all
interference frequencies. This method is to be recommended when there is good
equipotential bonding between the individual units. In such cases it is possible to make use
of the controller's voltage supply cable even if this is not electrically isolated.
Single-sided shield connection on the connecting cables:
Illustration 16: Example of single-sided shield connection
- for Zone 2 / 22
Technical data subject to change without notice..
08/2019