Connecting The Cable Shields Of The Profibus Pa Cables - Siemens Simatic CFU Commissioning Manual

Compact Field Unit in the enclosure for use in a hazardous area
11.3 Configuration with SIMATIC CFU PA bundle with aluminum enclosure
11.3.2.8

Connecting the cable shields of the PROFIBUS PA cables

The shields of the fieldbus cables must be connected to the functional earth FE. Use the shield
spring terminals mounted in the enclosure for this.
Pay attention to the bending radius of the fieldbus cables.
Shield spring terminals
One shield spring terminal can hold 2 fieldbus cables. With no load, securing with cable ties
is sufficient.
The shield spring terminal is suitable for cables with a diameter of 6 to 8 mm.
Required tools
Wire stripping tool
Procedure
To connect the cable shield, follow these steps:
1. Ensure that the insulation material of the fieldbus cable is removed in the area of the shield
spring terminal.
You can find information on this in the section "Cable cross-sections and wire end
ferrules (Page 45)".
2. Connect the fieldbus cable to the CFU and press the fieldbus cable into the shield spring
terminal.
3. Secure the fieldbus cable with cable ties to the dedicated area of the shield spring terminal.
122
①
Terminals (screw terminal or push-in termi‐
nal)
②
Terminal block 8x1
③
Fieldbus cable to field device
1
2
3
4
5
6
④
⑤
⑥
Insulation material removed (approx. 20 mm)
Shield spring terminal
Shielding bus
Commissioning Manual, 07/2018, A5E39252870-AC
SIMATIC CFU