Installation
3.5 EMC installation guidelines
Getting Started
22 Getting Started, FW V4.5, A5E03404762A AB
● Signal and data cables and line supply cables should not be routed in parallel to motor
cables.
● Signal and data cables and line supply cables should not cross motor cables; if crossing
is necessary, they should cross at an angle of 90°.
● Signal and data cables must be shielded to minimize coupled-in interference with respect
to capacitive, inductive, and radiative coupling.
● Particularly sensitive signal cables, such as setpoint and actual value cables must be
routed with optimum shield bonding at both ends and without any interruptions of the
shield.
● Spare wires for signal and data cables must be grounded at both ends to create an
additional shielding effect.
● All power cables (line supply cables, as well as motor cables) must be routed seperately
from signal and data cables. The minimum distance should be approximately 25 cm.
● The power cable between inverter and motor must be shielded. A symmetrical, 3-wire,
three-phase cable should be used here. Shielded cables with symmetrical three-phase
conductors (L1, L2, and L3) and an integrated, 3-wire, and symmetrically arranged PE
conductor are ideal for this purpose.
Cable shields
● Shielded cables must have finely stranded braided shields. Foil shields are not suitable
since they are much less effective.
● Shields must be connected to the grounded housings at both ends with excellent
electrical conductivity and a large contact area. Only when this method is used coupled-in
interference with respect to capacitive, inductive, and radiative coupling can be
minimized.
● Bonding connections for the cable shields should be established, where ever possible,
directly behind the cable entry into the inverter. For signal and data cables the shield
bonding options provided in the cabinet units should be used.
● Cable shields should not be interrupted, wherever possible, by intermediate terminals.
● In the case of both, the power cables and the signal and data cables, the cable shields
should be connected by means of suitable EMC shield clips or via electrically conductive
PG glands. These must connect the shields to the shield bonding options for cables and
the unit housing respectively with excellent electrical conductivity and a large contact
area.
● As plug connectors for shielded data cables (e. g. PROFIBUS cables) only metallic or
metallized connector housings should be used.
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