Electrical installation
Installation according to EMC (installation of a CE-typical drive system)
Control cables
6
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EDS84ABD302 EN 4.0
6.2.4 Control cables
ƒ Control c ables must be shielded to minimise interference injections.
ƒ For lengths of 200 mm and more, use only shielded cables for the analog input.
Under 200 mm, unshielded but twisted cables may be used.
ƒ For l engths of 3 m and more, use only shielded cables for digital inputs and relay
output. U nder 3 m, unshielded but twisted cables may be used.
ƒ Connect the shield correctly:
– The shield connections of the control cables must be at a distance o f at least 50
mm from the shield connections of the motor cables and DC c ables.
– 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).
ƒ To achieve an optimum shielding effect (in case of very long cables, with high
interference) one shield end of analog input and output c ables can be connected to
PE potential via a capacitor (e.g. 10 nF/250 V) (see sketch).
9300vec043
Fig. 6-4 Shielding of long, analog control cables
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