Terminal Strips - Siemens SINAMICS G120C Operating Instructions Manual

4.8.7

Terminal strips

Wiring variations of the terminal strips
All terminals with the reference potential "GND" are connected to each other inside the inverter.
The reference potentials "DI COM1" and "DI COM2" are galvanically 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."
Terminals 31, 32: When an optional 24-V power supply is connected to terminals 31, 32, the Control Unit remains in oper-
ation 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 .
→ If you also wish to use the power supply at terminals 31, 32 for the digital inputs, then you must con-
nect "DI COM1/2" and "GND IN" with one another.
Terminals 3, 4: For the analog input, you can use the internal 10-V power supply or an external voltage source. Typical
current consumption: 10 mA ... 20 mA.
→ If you use the internal 10-V supply, you must connect AI 0- to GND.
Figure 4-16 Example of wiring digital inputs with the inverter's internal 24-V power supply
SINAMICS G120C converter
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
Installing
4.8 Connecting the inverter
67