Siemens SINAMICS S120 Equipment Manual page 307

Table 8-7 MCBs by conductor cross-section and temperature
Conductor cross-section
1.5 mm
2
2.5 mm
2
4 mm
2
6 mm
2
24 V busbar
The trip characteristic of the MCBs must be selected to match the loads to be protected and
the max. current provided by the power supply unit in the event of a short-circuit.
Example: Calculating the 24 V DC current requirement
Table 8-8 Example, 24 V DC current requirement
Component
CU320
8 digital outputs
Active Line Module 36 kW
Motor Module 18 A
Motor Module 30 A
Encoders
Brake
Total:
Equipment Manual for Booksize Power Units
Equipment Manual, (GH2), 03/2006 Edition, 6SL3097-2AC00-0BP3
Max. value up to 40 °C
10 A
16 A
25 A
32 A
20 A
Number
1
8
1
2
3
5
5
Cabinet Configuration and EMC Booksize
Max. value up to 55 °C
6 A
10 A
16 A
20 A
20 A
Current consumption
[A]
0.8
0.1
1.5
0.85
0.9
0.25
1.1
8.3 24 V DC supply voltage
Total current consumption
[A]
0.8
0.8
1.5
1.7
2.7
1.25
5.5
14.25
8-11