Basics for wiring according to EMC
Control cables
5.3
5.3.4

5.3−3
EDSVF9383V EN 7.1−04/2012
5.3.4 Control cables
Æ’ Control cables must be shielded to minimise interference injections.
Æ’ For lengths of 200 mm and more, use only shielded cables for analog
and digital inputs and outputs. Under 200 mm, unshielded but twisted
cables may be used.
Æ’ Connect the shield correctly:
– The shield connections of the control cables must be at a distance of
at least 50 mm from the shield connections of the motor cables and
DC cables.
– Connect the shield of digital input and output cables at both ends.
– Connect the shield of analog input and output cables at one end (at
the drive controller).
Æ’ To achieve an optimum shielding effect (in case of very long cables,
with high interference) one shield end of analog input and output
cables can be connected to PE potential via a capacitor (e.g.
10 nF/250 V) (see sketch).
9300vec043
Fig. 5.3−1 Shielding of long, analog control cables
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