Siemens SINAMICS S120 Equipment Manual page 316

Cabinet Design and EMC
14.3 24 V DC Supply Voltage
Table 14-8 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 requirements with cold-plate cooling
Table 14-9 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:
316
Max. value up to 40 °C
10 A
20 A
25 A
32 A
20 A
Number
1
8
1
2
3
10
5
Max. value up to 55°C
10 A
10 A
16 A
25 A
20 A
Current consumption [A]
0,4
0,1
1,0
0,6
0,6
0,25
1,1
Manual, (GH4), 03.2007, 6SL3097-2AJ00-0BP4
Total current consumption [A]
0,4
0,8
1,0
1,2
1,8
2,5
5,5
13,2
Booksize cold-plate power units