Lenze Inverter EMC - Manual (Page 12)

Shielding
10
l
EDBEMV EN 1.3
5.3 Motor cables
z If the motor cable must be interrupted by chokes or terminals, the unshielded cable must not
be longer than 40 - max. 100 m (depending on the cable cross-section).
z If the motor cable must be interrupted by contactors, switches, or terminals, these must be
separated from the other components (with a min. distance of 100 mm).
z In case of cable lengths up to 500 mm a second shield (shield connection) is not required.
Motor supply cable
max. 500mm
Large-surface
contact of
cable shield
Braid
Heat-shrinkable tube
Cable gland acc. to EMC with
high degree of protection
Cable gland
5.4 Control cables
z The cables of the analog and digital inputs and outputs must be shielded. If short (up to 200
mm) and unshielded cables are used, they must be twisted.
z In case of the analog cables the shield must only be connected to the controller.
z In unfavorable conditions (very long cable, high interferences) it is possible in case of analog
cables to connect one shield end to PE via a capacitor (e.g. 10 nF/250 V) to have a better
shielding effect (see sketch).
z In case of digital cables the shield must be connected on both sides.
z The shields of the control cables must have a minimum distance of 50 mm to the shield
connections of the motor cables and DC cables.
Fig. 6 Shielding of long, analog control cables
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