Shielding Connection; Figure - Siemens SIWAREX FTC Device Manual

H C
ARDWARE ONFIGURATION AND
4.4.2

Shielding Connection

Special attention must be given to the shield strip for the shielded lines.
The interference resistance of the system can only be guaranteed if the properly
constructed.
A cable is shielded to decrease the affects of magnetic, electrical and
electromagnetic interference on this line. Interference on cable shielding is routed
to ground through shielding rails that are conductively connected with the housing.
To ensure that this interference does not become a source of interference, a low
impedance connection to ground is especially important.
Use only lines with mesh-shielding. The shielding should provide at least 80%
coverage.
For fastening the meshed shielding, use only metal cable clamps. The clamps
must cover as much shielding as possible and ensure a good contact.
Shield clamps must be ordered separately from the grounding elements. The area
covered by the shielding clamp is to be chosen corresponding with the cable
diameter.
Approximately 1.5 cm of the cable insulation must be exposed in the area of the
cable to be fastened to the shielding clamp. The exposed shielding is then pressed
firmly against the grounding element with the shielding clamp.
The following figure shows the assembly of the shield clamps.

Figure 4-2

The shielding should be pressed against the shielding rail by the shielding clamp.
SIWAREX FTC
A
SSEMBLY
Shield clamp assembly
4-15