Cascading Of The 24 V Supply - Siemens SINAMICS G120D Operating Instructions Manual

Example
Figure 4-15
The maximum permissible fusing of 32 A is based on the inverter with the lowest rated
power of 3 kW.
If the inverters are never simultaneously in operation, then also lower cable cross-sections
are permissible and smaller fuses are required.
4.2.12

Cascading of the 24 V supply

Installation using 24 V bus
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.
Figure 4-16
Converter with control units CU240D-2
Operating Instructions, 04/2014, FW V4.7, A5E34262100B AA
Fusing several inverters connected to a power bus
Advantage: Low installation costs.
Advantage: You can switch off the 400 V without interrupting the 24 V supply and thus
the fieldbus communication of the inverter.
24 V bus from T distributor or with separate power supply
Installation
4.2 Electrical Installation
53