Terminal Strips Behind The Lower Front Door - Siemens SINAMICS G120 Operating Instructions Manual

Installing
4.5 Connecting the interfaces for the inverter control
→ connect the 0 V of the power supply with the protective conductor.
If you use a common external power supply for terminals 31, 32 and the digital inputs, you
must connect "GND" and the reference potential of the digital input ("DI COM1/2/3") with each
other at the terminals.
You may use the internal 10V power supply or an external power supply for the analog inputs
at terminals 3, 4 and 10, 11. For an internal 10V power supply, you must connect AI 0 or AI 1
to GND.
4.5.3

Terminal strips behind the lower front door

Figure 4-15 Interconnection example of the digital inputs with external 24 V power supplies
All terminals with reference potential "GND" are connected with one another in the inverter.
Reference potentials for DI 1, DI 3 and DI 5, electrically isolated from "GND"
Reference potential for DI 0, DI 2, DI 4 and DI 6, electrically isolated from "GND"
Reference potential for DI 16 ... DI 19, electrically isolated from "GND"
Table 4-17 Supply options for the digital inputs
Supply
You are using an external 24 V supply
You are using the internal 24 V supply at terminal 9
94
Reference potential interconnection
As shown above, connect the reference potential of the exter‐
nal 24‑V supply to the reference potential of the corresponding
digital input.
Connect the appropriate reference potential of the digital input
to GND.
Converter with the CU250S-2 Control Units
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG