Siemens SINAMICS S120 Manuale di ingegneria - Pagina 9

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1 Engineering SINAMICS S120 Booksize

The rated input current of the Line Module at 3 AC 380 V is used as basis to

determine the fundamental apparent power S

not relevant here.

Minimum relative short-circuit power RSC as a function of the Line Module

Depending on the specific SINAMICS S120 Line Module Booksize being used, the

following minimum relative line short-circuit power levels must be maintained:

Table 1-1

S120 Line Modules Booksize

Basic Line Modules

Smart Line Modules

Active Line Modules with Active Interface Module

Active Line Modules in the Smart Mode

If a TN line system is specified on the secondary side, then a transformer with

grounded neutral point must be used. However, the loop resistance must be low

enough that fuses are ruptured as fast as required.

Recommendations for fusing Booksize Line Modules are provided here:

https://support.industry.siemens.com/cs/de/de/view/109749282

Minimum rated power of the matching transformer

For Booksize Line Modules, factor k, which takes into consideration the effect of

the supplementary losses in the transformer due to line-side harmonic currents,

must be applied with:

k = 1.27

This means that the rated transformer power must be higher than the rated Line

Module power by a factor of 1.27.

Engineering manual S120 Booksize

Entry-ID: 109808992,

V1.0,

04/2022

. The actual supply voltage is

converter

RSC required

≥ 30

≥ 70

≥ 30

≥ 70