Earth fault test
Earth fault tests should be carried at this stage:
0V-line earth fault test
¨
Connect the 0V line to the earth of the control panel
enclosure. This may have to be sustained for up to
1 minute for the fault to be detected. The display
should show:
Earth Fault
¨
Restore normal conditions. The display show:
Earth Fault cleared
+ve line earth fault test
¨
Now connect the +ve line to earth via a 10K ohm
resistor. This may have to be sustained for up to
1 minute for the fault to be detected. The display
shows an Earth fault message as above and after
restoration a cleared message.
"
If the resistance between Earth and Loop +ve
is in the order of a few ohms then this will be registered
as a ‘short circuit’.
Type of earth fault
Interrogate the [PSU] readings in the [Test/Eng] menu to
establish the type of Earth fault.
Type of Earth fault Earth (Ear) reading
No earth fault around 60
+ve line and earth greater than 75
-ve line and earth less than 40
¨
At the end of the test operate the [Repair] function at
the panel.
4188-856_i2_12/06_Generic Vigilon (Compact + VA) Comms. 49
Vigilon (EN & BS) Compact (VA) panels
Loop circuit tests
MICC CABLE
BOARD
TERMINALS
BOARD
PANEL
enclosure
L1 0V
10K
resistor
L1 0V
0V (-ve)
LINE
EARTH
FAULT
TEST
L1 (+ve)
LINE
EARTH
FAULT
TEST
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