Siemens SINAMICS G120C USS/MB - Connect the Line Supply, Motor and Braking Resistor; Permissible Line Supplies; TN Line System ((400-V-Umrichter))

4.8 Connect the line supply, motor and braking resistor
4.8.1 Permissible line supplies
The converter is designed for the following line supplies according to IEC 60364-1 (2005).
● TN system
● TT system
● IT system
General requirements on line supply
The plant builder or machine manufacturer must ensure for operation with rated current I
rated
that the voltage drop between the transformer input terminals and the inverter when operated
with its rated values is less than 4% of the transformer rated current
Restrictions for installation altitudes above 2000 m
Above an installation altitude of 2000 m, the permissible line supplies are restricted.
Restrictions for special ambient conditions (Page 414)
4.8.1.1 TN line system ((400-V-Umrichter))
A TN system transfers the PE protective
earth to the installed plant or system via a
conductor.
Generally, in a TN line system the neutral
point is grounded. There are versions of a
TN system with a grounded line conduc‐
tor, e.g. with grounded L1.
A TN line system can transfer the neutral
conductor N and the PE protective con‐
ductor either separately or combined.
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Inverter operated on a TN line system
● Inverter with integrated or external line filter:
– Operation on TN line systems with grounded neutral point permissible.
– Operation on TN line systems with grounded line conductor not permissible.
● Inverter without line filter:
– Operation permissible on all TN line systems.
Installing
4.8 Connect the line supply, motor and braking resistor
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF 65