PROTOUCH-WIDE MONITOR: user documentation - PRELIMINARY
DOC/PROTOUCH-WIDE_MONITOR; V0.2
DOC_PROTOUCH-WIDE_MONITOR_V0.3.docx
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3.2.5
Cabling of communication links
If the communication ports are non-isolated ports, cable shields have to be connected to chassis potential on both sides of the interconnection
cable. If the cable is very long, a thick copper wire (10 mm
2
) for potential adjustment is highly recommended. Fig. 9 shows a non-isolated system
with common chassis ground.
Some of the communication ports are galvanically isolated ports. In such cases the shield of the interconnection cable must be wired to chassis
potential
only
on
one
side
of
the
cable.
shows an isolated system with independent grounds.
Important
Note
Grounding of the cable’s shield
s using
pig-tail wires
are not recommended because of their high
impedance at high frequencies. It is better to clamp the shields onto a grounded copper rail.
Fig. 8
Isolated communication link
