Cabinet Configuration and EMC Booksize
7.3 24 V DC supply voltage
Equipment Manuel for Booksize Power Modules
Manual, (GH2), Edition 06.2005, 6SL3097-2AC00-0BP2
7-13
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.:
– 10 m for the supply cables
– 30 m for signal lines
• 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 Max. value up to 40 °C Max. value up to 55°C
1.5 mm
2
10 A 10 A
2.5 mm
2
20 A 10 A
4 mm
2
25 A 16 A
6 mm
2
32 A 20 A
24 V busbar 20 A 20 A
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 Number Current consumption
[A]
Total current consumption
[A]
CU320
8 digital outputs
1
8
0.8
0.4
0.8
3.2
Active Line Module 36 kW 1 1.1 1.1
Motor Module 18 A 2 0.85 1.7
Motor Module 30 A 3 0.9 2.7
Encoders 5 0.25 1.25
Brake 5 1.1 5.5
Total: 17.5
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