Siemens SINAMICS S120 Equipment Manual page 212

Cabinet Design and EMC
12.3 24 V DC Supply Voltage
Figure 12-1
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 12-8 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
12-12
Example of 24 V DC fuse protection
– 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
Max. value up to 55 °C
10 A
10 A
16 A
25 A
20 A
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2