24 V Power Supply And Connection Of Components - Siemens SINAMICS S120 System Manual

Note
Malfunction because 24 V supply voltage is too low
If the 24 V supply voltage falls short of the specified minimum value on a device in the assembly,
a malfunction can occur.
• Select an input voltage that is high enough to ensure a sufficient voltage on the last device.
Do not exceed the maximum value for the supply voltage. If required, supply the voltage to
the assembly at various locations.
Detailed information on supplying components with 24 V DC can be found in these manuals:
• SINAMICS S120 Manual for Chassis Power Units
• SINAMICS S120 Manual for Booksize Power Units
12.3.2

24 V power supply and connection of components

Active Line Modules Booksize, HF modules and DC link components are connected to the 24 V
DC power supply via the integrated 24 V DC busbars. The current carrying capacity of these
busbars is 20 A.The 24 V supply can be realized in various ways:
Using a Control Supply Module
When a Control Supply Module is used, the 24 V supply can be directly established via 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.
Note
If you use cables with a cross-section of 2.5 mm
side for the following cable types:
• Cables of the XLPE type
• Cables of the EPR type
• Cable with similar properties and which is thermally stable up to at least 90 °C
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.
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).
High Frequency Drive
System Manual, 10/2020, 6SL3097-5AH10-0BP0
12.3 24 V DC supply voltage
, no additional protection is required on the 24 V
2
Cabinet design and EMC
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