Connecting The Power Supply And Function Earth - Siemens CIM Operating Manual

Use copper cables at connectors with terminal connections
Use copper (Cu) cables for all supply lines that are connected to the device with terminals,
e.g. 24 VDC power supply cables to the 24 VDC power supply connectors.
Utiliser des câbles en cuivre sur les connexions à bornes
Utilisez des câbles en cuivre (Cu) pour tous les câbles d'alimentation qui sont raccordés à
l'appareil par des bornes, par exemple les câbles d'alimentation 24 V CC sur le connecteur
d'alimentation 24 V CC.
4.2.2

Connecting the power supply and function earth

A connected function earth discharges electrical charges from the metal enclosure.
The function earth also improves the discharge of interference generated by external power
cables, signal cables or cables for I/O modules to ground.
The connection for the function earth is labeled with the following symbol:
Electric shock and risk of fire
High voltage may be present in a defective device, which can cause fire or an electric shock
if touched. This can result in death and serious injury.
• Connect the device to the function earth before you put it into operation.
• The function earth terminal on the device must be connected to the function earth of the
• Never operate the device without function earth.
• If a device is defective, remove it from operation without delay and label it accordingly.
Note
The device should only be connected to a 12 to 24 V DC power supply which meets the
requirements of safe extra low voltage (SELV) according to IEC/EN/DIN EN/UL 61010-1.
Note
The power supply must be adapted to the input data of the device, see chapter "Technical
specification (Page 112)".
If there are voltage peaks on power supply lines, use a protective device in the form of a
varistor (MOV) UMOV = U-rated x 1.2 (BLITZDUCTOR BVT AVD 24 (918 422) or compatible).
CIM
Operating Manual, 11/2022, A5E51250518-AC
CAUTION
WARNING
control cabinet or system in which the device is installed.
Mounting and connecting the device
4.2 Connecting the device
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