Hardware manual PCD1.M2220-C15 │ Document 27-640 – Version ENG03 │ 2020-03-25
Saia-Burgess Controls AG
Introduction
Guidance
2-4
2
2.2.3
Wiring
Appropriate use
By qualified personnel only
●
230VAC power cables and data cables must be installed separately with
a minimum distance of 10 cm. It is recommended to also leave space
between the power and data cables in the switch cabinet.
●
Digital data/bus lines and analogue data/sensor lines should be installed sepa-
rately.
●
It is recommended to use shielded cables for analogue data cables.
●
The shielding should be earthed at the inlet to or outlet from the switch cabinet.
The shielding should be as short as possible and feature a cross-section that is
as large as possible. The central earthing point should be > 10 mm² and con-
nected to the earth cable via the shortest route.
●
The shielding is normally only connected with the control cabinet on one side
unless a potential equalisation with significantly lower resistance than the
shielding resistance is present.
●
Inductive loads that are installed in the same switch cabinet, e.g. contactor
coils, must be equipped with suitable suppressors (RC elements).
● Switch cabinet components with large field strengths, e.g. transformers or fre
-
quency inverters, should be shielded with separator plates with a good
earth connection.
Overvoltage protection for great distances or external cables
●
When installing cables outside buildings or over great distances, suitable
overvoltage protective measures must be taken. These measures are crucial,
particularly for bus cables.
●
For cables installed outdoors, the shielding must have a suitable power cable
capacity and be earthed at both ends.
●
The overvoltage conductor should be installed at the inlet of the switch cabinet.
