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Segment Protector
Installation and Commissioning
Screw Terminals: Cable and Connection Information
Permissible wire core section:
■
- Screw terminals with flexible or rigid wires: 0.2-2.5 mm²
Insulation stripping length: 7 mm
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If you use stranded connectors: Crimp on wire end ferrules
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Ensure that connectors are mechanically locked
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Torque required for tightening terminal screws: 0.4-0.5 Nm
■
Spring Terminals: Cable and Connection Information
Permissible wire core section:
■
- Spring terminals with flexible or rigid wires: 0.5-2.5 mm²
Insulation stripping length: 10 mm
■
Ensure that connectors are mechanically locked
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Torque required for tightening terminal screws: 0.4-0.5 Nm
■
4.4
Grounding / Shielding of Fieldbus Transmission Lines
All shields of the fieldbus transmission lines (trunks and spurs) are connected together inside
the Segment Protector, they have no connection to ground or DIN mounting rail.
Danger!
Risk of explosion through invalidation of type of protection
Grounding or shielding of signal lines of spurs can apply excessive amounts of energy to
intrinsically safe circuits. As a result, intrinsically safe circuits can overload connected field
devices that can produce sparks, or the circuits themselves can produce sparks. In both cases,
this can lead to the ignition of the surrounding atmosphere.
Never connect signal lines to cable shield or earth.
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Figure 4.1
If EMC requires you to ground the shield of the trunk or of the spurs of a fieldbus transmission
line, closely adhere to the information valid for this situation. For details refer to EN 60079-14
and to the corresponding information of the respective fieldbus type in use. Information on the
fieldbus type is found in the PROFIBUS PA User and Installation Guideline or FOUNDATION
Fieldbus H1 Application Guides.
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3
Stylized composition of the shield lines inside the Segment Protector
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Segment Protector
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PWR
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COM
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Trunk
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®
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