Siemens SINAMICS G150 Operating Instructions Manual page 112

Electrical installation
4.10 Signal connections
Note
The digital inputs (terminals -X520 and -X530) in the example are powered by the internal 24
V supply of the customer terminal block (terminal -X540).
The two groups of digital inputs (optocoupler inputs) have a common reference potential for
each group (ground reference M1 or M2). To close the circuit when the internal 24 V supply
is used, the ground references M1 / M2 must be connected to internal ground (M).
If power is not supplied from the internal 24 V supply (terminal -X540), the jumper between
ground M1 and M or M2 and M must be removed in order to avoid potential rounding. The
external ground must then be connected to terminals M1 and M2.
X520: 4 digital inputs
Table 4- 22 Terminal block X520
Terminal
1
2
3
4
5
6
DI: digital input; M1: ground reference; M: Electronics ground
1)
Max. connectable cross-section: 1.5 mm²
Note
An open input is interpreted as "low".
110
Designation
1)
DI 0 Voltage: - 3 ... 30 V
Current drain, typical: 10 mA at 24 V
DI 1
Reference potential is always terminal M1
DI 2
Level:
DI 3
- high level: 15 ... 30 V
- Low level: -3 ... 5 V
M1
M
Technical data
Ground reference
Electronics ground
Operating Instructions, 03/2012, A5E03263466A
Converter cabinet units