Siemens SINAMICS S120 Equipment Manual page 438

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8.3 24 V DC supply voltage

Is realized via the integrated busbars. The current carrying capacity of these busbars is 20 A.

The supply can be realized in two ways:

1. When a Current 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 terminal adapter.

2. When using an external 24 V power supply, (e.g. SITOP), the 24 V terminal adapter must

be used. Miniature circuit-breakers are recommended as overcurrent protective device for

cables and busbars. The ground potential M must be connected to the protective conductor

system (DVC A).

Example: 24 V supply with Control Supply Module

Equipment Manual, (GH2), 07/2007, 6SL3097-2AC00-0BP5

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