Grounding Of The Ethernet/Rs485 Cable - Siemens SENTRON 7KM PAC2200 Product Manual

Connection
4.4 Connecting the communication cable
4.4.4

Grounding of the Ethernet/RS485 cable

NOTICE
The upper limit values will be violated if the cable is not grounded
Compliance with the technical limit values for noise radiation and noise immunity is only
guaranteed if the cable is correctly grounded. The operator of the system is responsible for
ensuring compliance with the statutory limit values (CE mark).
Make a shield connection as described here.
Implementation
Ground the Ethernet or RS485 cable near to the PAC2200 measuring device. To do this,
expose the foil shield of the cable. Connect the exposed shield to a suitable grounding point
on the control cabinet, preferably a shielding bus.
● Be careful not to damage the foil shield of the cable when removing the cable jacket.
Fasten the exposed shield with a metal cable clamp or alternatively with a hose tie. The
clamp must clasp around a large portion of the shield and provide good contact.
● To allow good contact, a tin-plated or galvanically stabilized surface is ideal. With a
galvanized surface, the contact should be achieved using suitable screws. A painted
surface at the contact point is not suitable.
NOTICE
Loss of contact if the shield connection is incorrectly used for strain relief
If the shield connection is used for strain relief, the grounding contact can deteriorate or be
completely lost.
Do not use the contact point on the cable shield for strain relief.
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Equipment Manual, 12/2019, L1V30415167B-03
PAC2200