Basic Emc Rules - Siemens Sinamics G110M Getting Started

Contactor coils, relays and solenoid valves must have interference suppressors to reduce
high-frequency radiation when the contacts are opened (RC elements or varistors for AC
current operated coils, and freewheeling diodes for DC current-operated coils). The
interference suppressors must be connected directly on each coil.
3.3.3

Basic EMC rules

Measures to limit Electromagnetic Interference (EMI)
In the following list are the necessary measures that must be taken to ensure the correct
installation of the Converter within a system, which should minimize the effects of EMI.
Cables
● Keep all cable lengths to the minimum possible length; avoid excessive cable lengths.
● Route always signal and data cables, as well as their associated equipotential bonding
cables, in parallel and with as short a distance as possible.
● Do not route signal and data cables parallel to the line supply cables.
● Signal and data cables should not cross the line supply cables; if crossing is necessary,
they should cross at an angle of 90 °.
● Shield analog and data cables.
● Route particularly sensitive signal cables, such as setpoint and actual value cables, with
optimum shield bonding at both ends and without any interruptions of the shield.
● Ground spare wires for signal and data cables at both ends.
● Route all power cables (line supply cables) separately from signal and data cables. The
minimum distance should be approximately 25 cm.
Cable shields
● Use shielded cables with finely stranded braided shields. Foil shields are not suitable
since they are much less effective.
● Connect shields to the grounded housings at both ends with excellent electrical
conductivity and a large contact area.
● Bond the cable shields to the plug connectors of the Converter.
● Don't interrupt cable shields by intermediate terminals.
● In the case of both signal and data cables, the cable shields should be connected by
means of suitable EMC glands. The cables 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.
● Use only metallic or metallized connector housings for shielded data cables (for example,
PROFIBUS cables).
Distributed converter for SIMOGEAR geared motors
Getting Started, 01/2016, FW V4.7.6, A5E36100338B AD
Installation
3.3 Electrical Installation
47