Siemens SINAMICS S210 Operating Instructions Manual page 55

Neutral conductor fire caused by high currents
If you connect the converter without an isolation transformer to a supply system with 400 V
3 AC between the N-conductor and a line conductor (L1, L2 or L3), the harmonic currents in
the N-conductor can add up to values that are greater than the currents in the line conductors.
This heats up the N-conductor and can cause a fire.
● Take the harmonic currents into account when dimensioning the power supply cables.
Connection examples and cable cross-sections
Figure 3-4
● Sum of the input currents of all converters
● Fuses:
● Cables for the line connection up to the
● Cables for establishing the connection
SINAMICS S210 servo drive system
Operating Instructions, 01/2019, A5E41702836B AC
WARNING
Connection example for 230 V 1 AC
terminal box
between the terminal box and the converter
3.2 Permissible line supplies and connection options
≤ 24 A
3NA3812 or class J 30 A for UL/CSA
4 mm , dimensioned for I
2
2.5 mm , dimensioned for I
2
Configuring
≥ 32 A at 50 °C
rms rms
≥ 18.5 A at 50 °C
rms
53