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Installation
6.9.4
Shielding
6.9.5
Connection of shielding
6.9.6
Examples of shielding connections
EN 34/48
POLARIS REMOTE
- for Zone 1/21
POLARIS Remote KVM Analog 15" / 19.1"
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).
ATTENTION
Device can be damaged by differences in potential!
Avoid differences in potential.
Double-sided shield connection on the connecting cables
Illustration 12: 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.
Technical data subject to change.
08/2019
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