Schneider Electric Modbus Plus Network Bridge Multiplexer none Guía de instalación descargar pdf (Pagina 164)

150 Installing the Network Cable

890 USE 100 00

5.10 Checking the Cable Installation

This section describes how to visually inspect the cable and check its

end-to-end electrical continuity.

5.10.1 Inspecting the Cable Installation

V The cable runs should agree with the physical and electrical

protection requirements in Chapter 2.

V The cable runs should agree with the network cable routing

diagram as described in Chapter 2.

V The tap at each of the two end drop sites on each section of the

network should have its two internal termination jumpers

connected; they must be connected between the two center posts

and the W and B posts at the side of the tap opposite from the

trunk cable connection.

V The tap at each inline drop site should have its two internal

termination jumpers disconnected and removed.

V Service loops should exist on the trunk cable at each tap—service

loops should exist on each drop cable at the node device end of the

cable.

V Each tap should have the drop cable’s ground wire connected to its

grounding screw; the drop cable’s ground wire should also be

connected to the panel grounding point at the node device site.

V Adequate strain reliefs should be installed on the cable at each

drop.

V All identification labels should be in place and properly marked.

5.10.2 Checking the Cable Continuity

V Before checking continuity, disconnect all network cable connectors

from the node devices. Leave the drop cable ground lugs connected

to their site panel grounds.

V At any node device connector, measure the resistance between pins

2 and 3 (the signal pins). The resistance should be in the range

60 ... 80 W, which includes the cable wire resistance.

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Schneider Electric Modbus Plus Network Bridge Multiplexer none Guía de instalación Pagina 164