Operating Line Connection Components On The Line Supply - Siemens SINAMICS S120 Combi Equipment Manual

2.8.2

Operating line connection components on the line supply

The SINAMICS S120 Combi drive system is designed to be directly connected to TN, TT,
and IT line supplies with a rated voltage of 3-ph. 380 V to 3-ph. 480 V AC.
Figure 2-10
SINAMICS S120 Combi
Manual, Edition 05.2010, 6SL3097-4AV00-0BP0
Note
Line connection of motors
In combination with the drive system, the motors are generally approved for operation on
TN and TT line supplies with grounded neutral point and on IT line supplies.
In operation on IT line supplies, the occurrence of a first fault between an active part and
ground must be signaled by a monitoring device. In accordance with IEC 60364-4-41, it is
recommended that the first fault be eliminated as quickly as is practically possible in order
to minimize the temporary overload of the motor insulation.
For all other line supplies, except TN and TT line supplies with grounded neutral point
and IT line supplies, such as line supplies with a grounded phase conductor, an isolation
transformer with grounded neutral point (secondary side) must be connected between the
line supply and the drive system in order to protect the motor insulation from a continuous
and inadmissibly high stress level.
Direct operation on the line supply
Line-side power components
2.8 Line connection versions
45