Detnov CAD-250, Руководство по установке

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31
ENG
3.8.1. Loop continuity
The loop wiring must be implemented as a closed loop, therefore it is
essential to ensure the return of the loop line to the control panel.
Only connect the return of the earth connection to the control panel,
never to an external earth connection.
To connect a loop to the loop card, carry out the following steps:
1.
Identify the loop output terminals on the card.
2. Connect the positive S+ terminal to the positive loop output cable.
Connect the S- terminal to the negative loop output cable.
3. Connect the mesh at the output end of the cable to the outgoing
mesh connection terminal ( ⏚)
4. Connect the mesh at the return end of the cable to the return
mesh connection terminal ( ⏚)
5. Put the MAIN BOARD protection back (see section 3.3).
3.8.2. Connecting devices to the main line
As extracted from section 3.6.1, the continuity of the loop wiring is
of vital importance for the proper functioning of the facility and even
more so if it is possible to avoid earth faults. In schematic terms, the
connection must be similar to the following diagram.
When opening the loop line to connect it to the + and - terminals
of the device, ensure the connection of the two ends of the shield.
To do so, wind them up and protect the joint with insulating tape in
order to avoid any earth leakage of the mesh.
Then tape the entire cable in the shielding area so that the shielding
cannot generate any earth faults.
DEVICE
RETURN cable >
< OUTPUT cable
INSULATING TAPE
Item Description
Loop return mesh connection
R-
Loop return negative pole connection
R+
Loop return positive pole connection
Loop output mesh connection
S-
Loop output negative pole connection
S+
Loop output positive pole connection