Power Supply And Connection Of Components - Siemens SINAMICS S120 Combi Manual

Cabinet design and EMC
12.4 24 V DC supply
12.4.2 24 V power supply and connection of components
The S120 Combi with the expansion axes (Motor Modules) and DC link components are
connected to the 24 V DC via the integrated 24 V busbars. The current carrying capacity of
these busbars is 20 A.
The power can be supplied in two ways:
1. When using an external 24 V power supply, e.g. SITOP, the 24 V connector must be
used. The external power supply should be located very close to the load (max. cable
length 30 m). Miniature circuit breakers with tripping characteristic D are recommended
as overcurrent. The ground potential M must be connected to the protective conductor
system (DVC A).
Figure 12-1
2. When a Control Supply Module is used, the 24 V supply can be directly established
through the busbars. The electronic current limiting function integrated in the Control
Supply Module protects the busbar system when a fault occurs. Additional loads can be
connected via the 24 V connector.
Figure 12-2
278
Example of an external 24 V power supply
Example of a 24 V supply with Control Supply Module
SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7