Siemens SINAMICS G120X, Operating Instructions Manual

Page: 1107 / 1148

Depending on the rated output and the rated input current of the device, different requirements
result for the direct connection to the low-voltage system.
LO base load
power
LO input cur‐
rent
≤ 1 kW - The converters comply with the requirements of IEC 61000-3-2.
> 1 kW ≤ 16 A No limit value requirements are defined in IEC 61000-3-2 for professio‐
nally used devices of this output range.
Notification of the network operator and a system evaluation according
to IEC 61000-3-14 or 61800-3 Annex B.4 are recommended.
> 16 A and ≤
75 A
The converters comply with IEC 61000-3-12 (Table 4), provided that the
short-circuit capacity (SSC) at the point of connection of the customer
system to the public network is greater than or equal to the value in the
formula below.
S
SC
= U²
rated
/ Z ≥ 120 · √3 · U
rated
· I
LO
The installer or plant operator must ensure that the converters are only
connected to a supply system with sufficient short-circuit capacity.
If the converters are to be connected to a supply system with a lower
short-circuit capacity, the installer or plant operator must obtain a con‐
nection approval from the network operator in regard to harmonic cur‐
rents.
> 75 A: No limit values for current harmonics are defined for these devices in the
IEC standards. Notification of the network operator and a system eval‐
uation according to IEC 61000-3-14 or 61800-3 Annex B.4 are recom‐
mended.
The converters FSH and FSJ always require an upstream line reactor
and an upstream line filter for operating on the public low-voltage sys‐
tem.
When operated with LO rated power, the converter generates the following typical current
harmonics (as a percentage of the fundamental current):
Converter R
SC
I5 I7 I11 I13 I17 I19 I23 I25 THC
FSA … FSG 120 38% 18% 8% 5% 4% 3% 3% 2% 43%
FSH, FSJ with
2% line reactor
50 37% 13% 7% 3% 3% 2% 1% 1% 40%
The SIZER configuration tool allows the individual calculation of the harmonic parameters.
Download SIZER ( http://support.automation.siemens.com/WW/view/en/
10804987/130000 )
Line Harmonics Filter (LHF) for reducing current harmonics
The passive LHF (Line Harmonics Filters) available for the converter allow a significant
reduction of the current harmonics. It is especially recommended that LHF be used if devices
FSE ... FSG (above 75 A rated input current) are to be operated on the public low-voltage
system.
Technical data
11.8 Electromagnetic compability of the converter
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
1105