Connection of the Components
5.6 Electronics Power Supply
Guide for the SINUMERIK 840D sl machine configuring
Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0
5-49
Circuit-breakers
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 bunched
● Conductor limit temperature 70°C for normal operation
● Maximum cable length:
– 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 5-22 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 tripping characteristic of the circuit-breakers must be chosen appropriately for the
consumers to be protected and the maximum current provided by the power supply device in
a short-circuit situation.
The MCBs can be selected according to Siemens catalog "BETA Modular Installation
Devices - ET B1".
5.6.7 Line formation
The corresponding different supply lines should be configured and constructed depending on
the size of the drive group and the overall length. This ensures that should one line fail, the
power supply to all attached consumers does not fail. The fault-free consumer lines remain
operational.
The maximum connectable cross-section of the consumers must also be considered:
● 6.0 mm
2
for the 24 V power supply terminal adapter of the power busbar
● 2.5 mm
2
for the 24 V power supply infeed terminal of the CU and SMC components
● 0.5 mm
2
for the digital inputs/outputs and analog inputs/outputs
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