Wiring
5
5.1 EMC installation guidelines
5.1.1 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.
5.1.2 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 eects 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 Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 49
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