Cabinet design and EMC
12.4 24 V DC supply
SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7
279
Note
When using cables with a cross
-section of 2.5 mm
2
, no additional protection is required on
V side if a type XLPE or EPR cable, or a cable with a similar quality and with a
thermal stability of up to 90 °C is used.
● A 24 V connector must be plugged onto the 24 V busbar between each S120 Combi,
expansion axis and DC-link component
● Insertion and withdrawal is only permissible in the no-voltage state
● Only 5 withdrawal and insertion cycles are permissible
Overcurrent protection in the 24 V solid-state circuit
The cables on the primary and secondary sides of the 24 V power supply unit must be
protected against overcurrent.
The protection on the primary side depends on the instructions of the equipment
manufacturer.
The protection on the secondary side depends on the actual conditions. Please note the
following:
● Loading from loads, possibly the demand factor against the operation of the machine
● Current carrying capacity of the conductors used and cables in normal and short-circuit
conditions
● Ambient temperature
● Cable bundling (laying cables in a common duct)
● Cable routing type
Overcurrent protective devices can be used in compliance with local installation regulations.
Circuit breakers as listed in the Siemens "NSK" catalog are recommended as overcurrent
protection devices on the primary side.
Miniature circuit breakers or SITOP select (Article number 6EP1961-2BA00) are
recommended as overcurrent protection devices on the secondary side. The MCBs can be
selected according to Siemens catalog "BETA Modular Installation Devices - ET B1".
When selecting the miniature circuit breaker, local installation regulations must be carefully
complied with.
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