Cable Protection And Cascading Of The 400 V Supply - Siemens SINAMICS G120D Original Instructions Manual

4.2.12

Cable protection and cascading of the 400 V supply

Cable protection for individual inverters
If you individually protect an inverter, then you must protect the inverter feeder cable using a
fuse.
Table 4- 11
Rated power
0.75 kW
1.5 kW
3 kW
4 kW
5.5 kW
7.5 kW
UL-approved fuses must be used in North America. For additional information, please refer
to Catalog D31.
Installation with power bus
For installations with several inverters, the inverters are normally supplied from a 400 V
power bus using T distributors.
Figure 4-14
The following options are available for the 24 V supply of the inverter:
1. A T distributor with integrated power supply unit supplies the 24 V.
2. An external power supply unit supplies the 24 V.
The inverter can conduct a maximum current of 8 A through its 24 V connector.
Protection of the 400V cable
Cable protection depends on the following conditions:
● Cable routing type.
● Limit values of the cables and system components, e.g. the T distributor.
● Country-specific guidelines.
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
Individual fuse protection
Power Module
6SL3525-0PE17-5AA1
6SL3525-0PE17-5AA1
6SL3525-0PE17-5AA1
6SL3525-0PE17-5AA1
6SL3525-0PE17-5AA1
6SL3525-0PE17-5AA1
Inverter supplied via a power bus
Advantage: Low installation costs.
Advantage: You can disconnect the 400 V without interrupting the 24 V supply and
therefore without interrupting the fieldbus communication of the inverter.
Frame size Fuse
FSA 10 A 3NA3803
FSA 10 A 3NA3803
FSB 16 A 3NA3805
FSC 20 A 3NA3807
FSC 20 A 3NA3807
FSC 32 A 3NA3812
Installation
4.2 Electrical Installation
Circuit-breaker
3RV1021-1JA10
3RV1021-1JA10
3RV1021-4AA10
3RV1021-4BA10
3RV1021-4BA10
3RV2021-4PA10
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