Connecting Cables Using Screw Terminals; Connecting The Cable Shields Of The Profibus Pa Cables; Connecting The Functional Earth To The Cfu - Siemens Simatic CFU Commissioning Manual

7.5.4

Connecting cables using screw terminals

Note
Cable cross-sections
With small conductor cross-sections and stranded cables, there is a risk that the cable will be
bent when it is plugged into the terminal.
Recommendation
Use wire end ferrules to prevent contact problems or short circuits.
● You can find information on preparing the cables in section "Cable cross-sections and wire
end ferrules (Page 45)".
● You can find information on tools in section "Tools and tightening torques (Page 149)".
Connecting the cable
Procedure
1. Prepare the cables.
2. Open the screw terminal using the screwdriver.
3. Insert the cable into the opening as far as it will go.
4. Tighten the screw terminal on the cable using a screwdriver.
Pay attention to compliance with the required tightening torques.
Result
The cable is contacted firmly in the connector.
7.6

Connecting the cable shields of the PROFIBUS PA cables

This section is only applicable to a CFU PA.
Introduction
The shields of the fieldbus cables must be connected to the functional earth FE. Guide the
shield as far as possible from the CFU connections.
Shielding fieldbus cables with SIMATIC CFU PA bundle with aluminum enclosure
Refer to section "Connecting the cable shields of the PROFIBUS PA cables (Page 122)".
7.7

Connecting the functional earth to the CFU

The CFU must be connected to the functional earth.
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC
7.7 Connecting the functional earth to the CFU
Connecting
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