Wiring; Emc Installation Guidelines; Connections And Interference Suppression; Basic Emc Rules - Siemens SINAMICS G115D Operating Instructions Manual

Wiring

4.1

EMC installation guidelines

4.1.1

Connections and interference suppression

Set up reliable connections and make sure that all connections cannot be interrupted.
Screwed connections on painted or anodized metal components must be made either by
means of special contact washers, which penetrate the isolating surface and establish a
metallically conductive contact, or by removing the isolating surface on the contact points.
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.
4.1.2

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 and motor cables.
• Signal and data cables should not cross the line supply and motor cables; if crossing is
necessary, they should cross at an angle of 90 °.
• Shield signal 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.
SINAMICS G115D distributed drive
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
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