Siemens SINAMICS Series Equipment Manual page 295

The following conditions apply to the cables when the MCBs are selected from the following
table:
• Ambient temperature 40 °C or 55 °C
• Max. 1 conductor pair, bundled
• Conductor limit temperature 70 °C for normal operation
• Cable length max.:
• To be routed separately from other cables and conductors carrying operating current.
• Cable type: PVC conductor cable
Table 7-8 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 24 V DC current requirements
Table 7-9 Example of 24 V DC current requirements
Component
CU320
8 digital outputs
Active Line Module 36 kW
Motor Module 18 A
Motor Module 30 A
Encoders
Brake
Total:
Equipment Manuel for Booksize Power Modules
Manual, (GH2), Edition 06.2005, 6SL3097-2AC00-0BP2
– 10 m for the supply cables
– 30 m for signal lines
Max. value up to 40 °C
10 A
20 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
10 A
10 A
16 A
20 A
20 A
Current consumption
[A]
0.8
0.4
1.1
0.85
0.9
0.25
1.1
7.3 24 V DC supply voltage
Total current consumption
[A]
0.8
3.2
1.1
1.7
2.7
1.25
5.5
17.5
7-13