Terminal Strips On Cu240E-2 Control Units - Siemens SINAMICS G120 Operating Instructions Manual

4.5.6

Terminal strips on CU240E-2 Control Units

Terminal strips with wiring example
Figure 4-17 Wiring example of the digital inputs with the internal inverter 24 V power supply
All terminals labelled with reference potential "GND" are connected internally in the inverter.
Reference potentials "DI COM1" and "DI COM2" are electrically isolated from "GND".
→ if, as described above, you use the 24‑V power supply from terminal 9 to supply the digital
inputs, then you must connect "GND" with "DI COM1" and "DI COM2" at the terminals.
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 the fieldbus communication, for example.
→ At terminals 31, 32, only connect a power supply that is in accordance with SELV (Safety
Extra Low Voltage) or PELV (Protective Extra Low Voltage).
→ if you also wish to use the power supply at terminals 31, 32 for the digital inputs, then you
must connect "DI COM1/2" and "GND IN" with one another at the terminals.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
Installing
4.5 Installing Control Unit
101