Loop circuit tests
The loop circuit test involves checking the loop circuit resistance
and capacitance and then to carry out open circuit, short circuit
and break tests.
Loop resistance and capacitance
¨
Power down and disconnect both ends of the loop 0V
wiring at the control panel, whose resistance and
capacitance are to be measured.
Resistance
¨
Using a multimeter measure the resistance between the
loop 0V (End 1) and loop 0V (End 2). In practice this
should not be greater than 13 ohms.
Capacitance
¨
Check the capacitance between the loop 0V and cable
screen. The capacitance should not be greater than
1.0uF. Also the cable end-1 and end-2 should read the
same value.
How to [Repair] a loop circuit
When a loop circuit is tested for open or short circuit fault
or if a genuine wiring short or open circuit fault should
occur, then rectification action must be taken. To rectify
the fault remove the fault and process the repair command
at the control panel.
a.
Press the Menu On/Off button and select
[Test /Eng].
b.
Select [Usercode] and if a password access is
required, type in your user code and press the
Enter button.
c.
Select [Loop] and then momentarily select
<etc> until [Repair] appears on the display.
d.
Select [Repair] and type in the loop circuit you
want to repair, for example loop 1or2and then
select [Enter].
Loop short circuit test
A loop short circuit isolation test should be carried out at this
stage. It is recommended that the sounders are switched On
before conducting this test.
End 1 Short test
¨
Short circuit the pair of loop terminals at End-1. There
should be no loss of any part of the system. The
display shows:
Wiring changed - short at card x number
y loop z
Wiring changed - loop split
¨
After rectification re-allocate the loop circuit.
End 2 and Mid circuit Short test
¨
A short circuit test should then be repeated at End-2
and again at mid point of the loop.
&
The loop circuit on which a short circuit
occurred must be repaired using the [Repair]
function.
¨
At the end of the test operate the [Repair] function at
the panel.
4188-856_i2_12/06_Generic Vigilon (Compact + VA) Comms. 47
Vigilon (EN & BS) Compact (VA) panels
Loop circuit tests
L
1
0V
TERMINALS
BOARD
PANEL
enclosure
MICC CABLE
SHORTING LINK
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