Installing
3.2 Connecting
SINAMICS G120C, FSD ... FSF inverters
Compact Operating Instructions, 11/2016, FW V4.7 SP6, A5E39339884B AA
29
Figure 3-6 Wiring example of the digital inputs with the internal inverter 24 V power supply
All terminals with the reference potential "GND" are connected to each other inside the
inverter.
Reference potentials "DI COM1" and "DI COM2" are electrically isolated from "GND".
→ If you use the 24-V power supply at terminal 9 to power the digital inputs, you must
interconnect "GND," "DI COM1," and "DI COM2."
When an optional 24-V power supply is connected to terminals 31, 32, the Control Unit
remains in operation even after the Power Module has been disconnected from the line
supply. The Control Unit thus maintains fieldbus communication, for example.
→ Connect only power supplies that are SELV (Safety Extra Low Voltage) or PELV
(Protective Extra Low Voltage) to terminals 31, 32 .
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