Siemens SINAMICS S120 Manual page 695

Figure 12-21 Example of a 24 V supply via a Control Supply Module
Using an external 24 V power supply
When using an external 24 V power supply, e.g. SITOP, the 24 V terminal adapter must be
used. The external power supply should be located very close to the load. Surge arresters
are required for cables longer than 30 m (see Chapter "Surge protection (Page 697)").
We recommend using miniature circuit breakers with tripping characteristic D as overcurrent
protection devices for the cables and busbars. The ground potential M must be connected to
the protective conductor system (PELV/SELV).
Figure 12-22 Example of a 24 V supply via an external power supply
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
Cabinet design and EMC Booksize
12.6 24 V DC supply voltage
695