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Commissioning instructions
2km Loop circuit - tests using LDT
Loop diagnostic tool
Applicable for panel fitted with VIG-LPC-EN or COMPACT-LPC-EN cards
Where 2km loop cards are fitted in a VIGILON or VIGILON Compact panel having compatible loop
devices then the Loop Diagnostics Tool should be used to test the loop circuits.
For information on the Loop Diagnostic Tool see the Loop diagnostic tool help guide.
During certain tests using the Loop Diagnostic tool where directed by the tool it may be necessary
to repair a loop circuit after a test.
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.
Press the Menu On/Off button and select [Test /Eng], [Usercode] and if a password
access is required, type in the PIN and press the Enter button. Select [Loop] and then
momentarily select <etc> and select [Repair] and type in the loop circuit you want to
repair, for example loop 1or 2 and then select [Enter].
Loop resistence measured by the panel
The loop cards VIG-LPC-EN or COMPACT-LPC-EN measures and displays the loop resistance on
the panel screen during power up of the loop circuits, see page 52. The measured resistance can
be viewed at any time after allocation using the [info] menu under the Loop Card status at the
panel.
However the loop resistances and many other loop parameters can be measured and viewed using
a Loop Diagnostic Tool.
62
1km Loop circuit - manual tests
Applicable for panel fitted with VIG-LPC and COMPACT-LPC loop cards
The loop circuit tests involve checking the loop circuit resistance, capacitance and then carrying 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 for 1Km cable ONLY.
Dependent on the number of devices on a loop circuit over 1Km cable length ONLY,
an allowance can be made for contact resistance of up to 10mW per device.
Over 1Km cable length ONLY:
having 50 devices
having 100 devices
having 200 devices
¨
Check the loop cable screen to loop 0V resistance this should be an open circuit.
Capacitance measure
¨
Typically where alternative allowed loop cable types are being used then a measured
capacitance between the loop 0V and cable screen should practically be no be greater
than 0.21uF. However the Loop Driver is capable of driving a higher capacitance.
4188-856_issue 7_07/15_Generic Vigilon (Compact + VA) Comms.
Worse case measured loop resistance:
no greater than 13.5 ohms
no greater than 14 ohms
no greater than 15 ohms
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