Siemens SINAMICS G120D - Page 38

Installation
4.2 Electrical Installation
Converter with control units CU250D-2
38 Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
Example
In one installation, either the inverters of group ① or the inverters of group ② are in
operation, but never both groups
① and ② simultaneously.
Figure 4-7 Protection of two inverter groups via a shared 400-V feeder
The sum of the rated input currents is:
● Group
①: 7.2 A + 7.2 A + 9.5 A = 23.9 A ≤ 24 A
● Group
①: 17.7 A + 3.8 A + 2.1 A = 23.6 A ≤ 24 A
You can power all the inverters through a shared fuse.
Feeder protection according to IEC
Table 4- 5 Feeder protection according to IEC
Max. rated current of the protec-
tion device
Article No. of the fuse
Article No. of the circuit breaker
25 A 3NA3810 3RV2021…, 3RV1031…,
3RV2031…
30 A
-
3RV1742