Siemens SINAMICS G120 Operating Instructions Manual page 112

Installing
4.5 Connecting the interfaces for the inverter control
→ connect the 0 V of the power supply with the protective conductor.
→ if you also wish to use the power supply at terminals 31, 32 for the digital inputs, then you
must connect "DI COM" and "GND IN" with one another at the terminals.
You may use the internal 10 V power supply or an external power supply for the analog inputs.
→ When you use the internal 10 V power supply, you must connect AI 0 or AI 1 with "GND".
Additional options for wiring the digital inputs
Connecting P-switching contacts with an external
Connecting M-switching contacts with an external
Note
When a contact switching to M is connected, a ground fault at the digital input can lead to the
input being unintentionally controlled.
112
power supply
power supply
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
You must remove the jumper between
terminals 28 and 69 if it is necessary to
have electrical isolation between the ex‐
ternal power supply and the internal in‐
verter power supply.
Remove the jumper between terminals
28 and 69.
Converter with the CU230P-2 Control Units