Basic Emc Rules - Siemens SINAMICS G120D Operating Instructions Manual

Installation
4.2 Electrical Installation
M25 x 1.5
M32 x 1.5
4.2.5

Basic EMC Rules

Measures to limit Electromagnetic Interference (EMI)
Listed below are the necessary measures that must be taken to ensure the correct installation of
the converter within a system, which will minimize the effect 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.
• Don't route signal and data cables and line supply cables 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 °.
• 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.
• Route all power cables (line supply cables, as well as motor cables) separately from signal and
data cables. The minimum distance should be approximately 25 cm.
Exception: hybrid motor cables with integrated shielded temperature sensor and brake
control wires are allowed.
• Shield the power cable between converter and motor. We recommend shielded cables with
symmetrical three-phase conductors (L1, L2, and L3) and an integrated, 3-wire, and
symmetrically arranged PE conductor.
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.
38
Connection thread/length
A D [mm] C [mm]
7.5 29
8.0 32
Clamping Clamping
range without range max/
inlet max/min min [mm]
[mm]
20 ... 13 16... 10
25 ... 20 20 ... 13
Operating Instructions, 10/2020, FW V4.7 SP13, A5E34262100B AH
Spanner Article No.
width SW * E
30 x 33 bg255mstri
36 x 39.5 bg232mstri
Converter with the control units CU240D-2