Operating instructions

Electrical installation
4.5 EMC-compliant design
Drive converter cabinet units
52 Operating Instructions, 10/2008, A5E00288214A
4.5 EMC-compliant design
The following section provides some basic information and guidelines that will help you
comply with the EMC and CE guidelines.
cabinet assembly
● Connect painted or anodized metal components using toothed self-locking screws or
remove the insulating layer.
● Use unpainted, de-oiled mounting plates.
● Establish a central connection between ground and the protective conductor system
(ground).
Shield gaps
● Bridge shield gaps (at terminals, circuit-breakers, contactors, and so on) with minimum
impedance and the greatest possible surface area.
Using large cross-sections
● Use underground and grounding cables with large cross-sections or, better still, with litz
wires or flexible cables.
Laying the motor supply cable separately
● The distance between the motor supply cable and signal cable should be > 20 cm. Do not
lay signal cables and motor cables in parallel to each other.
Use anti-interference elements
● Lay an equalizing cable parallel to the control cable (the cable cross-section must be at
least 16 mm²).
● If relays, contactors, and inductive or capacitive loads are connected, the switching relays
or contactors must be provided with anti-interference elements.
Cable installation
● Cables that are subject to or sensitive to interference should be laid as far apart from
each other as possible.
● All cables are to be laid as close as possible to grounded enclosure parts such as
mounting plates or cabinet frames. This reduces both noise radiation and interference
injection.
● Reserve cores of signal and data cables must be grounded at both ends to achieve an
additional shielding effect.
● Long cables should be shortened or laid in noise resistant areas to avoid additional
connecting points.