Siemens S120 Manual page 77

TT system
In a TT system, a point of the generator or the transformer is grounded, normally the neutral
point. The housing of the consumer is connected with the ground using a separate cable.
Figure 3-27
● Power Modules without line filter can be operated on all TT line systems.
● Power Modules with integrated or external line filter can be operated only on TT line
IT system
In an IT system, the voltage network is either not connected with ground or connected only
using a high-resistance impedance. The housing of the consumer is connected with the
ground using a separate cable.
Figure 3-28
● Power Modules without line filter can be operated on all IT line systems.
● Power Modules with integrated or external line filter can be operated only on IT line
AC Drive
Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
TT system
systems with grounded neutral point.
IT system
systems.
Mains connection and line-side power components
3.9 Line connection variants
77