2015-01
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Installation VisuNet RM and VisuNet PC
Example 1:
If a low-impedance equipotential bonding system (building grounding system) is effective
under all operating conditions, both ends of the shield must be connected and grounded.
Caution is necessary, however, if transients that cannot be statically measured are produced
when machines are switched.
Example 2:
If there is no equipotential bonding system or only a poor system, or if the equipotential
bonding system does not have a very low impedance or has a nigh noise voltage, variant 2 or
3 should be preferred.
Which of these three concepts is used must be determined by the user on a case-to-case
basis (best interference suppression and safety).
No liability can be accepted by the manufacturer for this decision.
A non-connected shield at the VisuNet RM/PC end must always be properly insulated in order
to prevent sparking!
The Box-10-A (Ethernet patch panel) allows the shield to be optionally connected or not
connected to ground. It is connected by means of a small contact spring on the DIN rail.
Each user must ascertain which form of EMC protection is necessary, and offers sufficient
reliability for their particular installation. In systems that are relatively insusceptible to
electromagnetic interference, it may be adequate to connect and ground only one end of the
shield.
