Power Supply; Application - Siemens SINUMERIK ONE NCU 1740 Equipment Manual

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Connecting

8.5 Power supply

8.5
Power supply
8.5.1

Application

This interface is provided exclusively for connection of the external power supply.
Note
When using external power supplies (e.g. SITOP), the ground potential of the power supply must
be connected with the protective ground connection of the system (PELV).
Note
Ground potential and housing (PE) are connected internally with low impedance.
Interface characteristics
The following special requirements apply to the connecting cables:
• The 24 V DC cable must be approved for temperatures up to 70 °C.
• Select the permitted conductor cross-section in accordance with national regulations (NEC,
VDE,...) from the "X124 interface" table below. The basis for this can be the output current
of the 24 V DC power supply or the overcurrent protection device used in the 24 V circuit. If
the 24 V power supply unit that is used has a short-circuit current greater than 50 A, a
corresponding overcurrent protection device, which limits to this value, must be used
upstream of the product.
• The PE connection must have a maximum length of 10 m and a minimum cross-section
according to EN 60204-1.
• Strip 7 mm of the insulation from the cables for connection to the 24 V DC connector.
• Observe the permissible bending radius of the cables.
• Route all of the cables so that they cannot be crushed or pinched.
• Route all of the cables so that they cannot come into contact with chafing edges.
Les câbles de raccordement doivent répondre aux conditions suivantes :
• Le câble 24 V CC doit être autorisé pour des températures jusqu'à 70 °C.
• Choisir la section de conducteur conformément aux prescriptions nationales (NEC, VDE,...)
dans le tableau ci-dessous "Interface X124". Le courant de sortie de l'alimentation 24 V CC ou
le dispositif de protection contre les surintensités du circuit de commande 24 V peuvent
servir de base. Si le courant de court-circuit de l'alimentation 24 V CC utilisée est supérieur
à 50 A, placer un dispositif de protection contre les surintensité en amont du produit qui
limite le courant à cette valeur.
• Le raccordement PE doit être dimensionné avec une longueur maximale de 10 m et une
section minimale correspondant à EN 60204-1.
• Dénuder les conducteurs de raccordement au connecteur 24 V CC sur 7 mm.
60
Equipment Manual, 10/2021, A5E51087503B AA
NCU 1740

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