Siemens SINAMICS S120 Equipment Manual page 213

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 requirements with cold-plate cooling
Table 12-9 Example: 24 V DC current requirements with cold-plate cooling
Component
CU320
8 digital outputs
Active Line Module 36 kW
Motor Module 18 A
Motor Module 30 A
SMC20
Brake
Total:
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2
Number
1
8
1
2
3
10
5
Current consumption [A]
0.4
0.1
1.0
0.6
0.6
0.25
1.1
Cabinet Design and EMC
12.3 24 V DC Supply Voltage
Total current consumption [A]
0.4
0.8
1.0
1.2
1.8
2.5
5.5
13.2
12-13