Siemens Sinamics S120 Manual page 721

Figure 12-19 Example of a 24 V supply via a Control Supply Module
2. 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 (max. cable length
10 m). 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 12-20 Example of a 24 V supply via an external power supply
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
Cabinet design and EMC Booksize
12.7 24 V DC supply voltage
721