CIE-A-200 Control Panel Engineering and Commissioning Manual
52
Initialisation
Normal Readings
Ensure that your addressable device loop has the correct continuity and insulation integrity. With a digital test
meter there should be a continuity reading of approximately 1.2 ohms per 100m of 1.5mm
2
cable, and no
continuity should be read between cores.
With the loop stopped and the loop connector block removed from the control panel, measure the continuity
between
Loop End 1
–ve
and
Loop End 2
–ve.
There should be a maximum resistance of approximately 24
ohms, equating to approximately 1.2 ohms per 100 metres.
Likewise measure the continuity between
Loop End 1 Scrn
and
Loop End 2 Scrn.
There should be a
maximum resistance of approximately 24 ohms, and this reading will normally be slightly lower than that of
the
Loop
–ve
continuity, due to the greater surface area of the screen. Screen integrity is of critical
importance.
A measurement of the continuity between
Loop End 1 +ve
and
Loop End 2 +ve
should show a very high
resistance, as the isolator within each device only provides continuity when energised by the control panel.
Measuring the insulation resistance between the
Loop
–ve
and the
Loop Screen
should show no continuity.
Remember that a low voltage electronic test meter should be used, and its accuracy is likely to be low when
measuring high resistances, but this will give enough information to show insulation integrity.
Do not use a high voltage insulation test meter whilst any devices or the control panel are connected
as they will suffer damage
.
Initialisation Process
When the control panel is powered up the following LED will be continuously on, and the addressable device
loop must be initialised at Access Level 3 (Engineer).
DISABLED
During initialisation, a screen similar to the following will be displayed.
The number shown under
Loop Dev Init
gives a count of the number of devices initialised on the loop. If the
loop is found to be complete this is followed by a tick, whereas if the loop is found to be incomplete this is
followed by a cross.
The number shown under
Init Complete
gives a count of the total number of devices initialised on the system.
If initialisation is completed correctly this is followed by a tick, whereas if there is any failure in initialisation
this is followed by a cross.
In normal initialisation conditions the control panel will start from Loop end 1, find, interrogate and address
each device on the loop one at a time. When the second end of the loop is reached the control panel will
display a tick or cross as shown above to indicate whether or not a complete loop was found.
INITIALISING LOOP
Loop Dev
Spur Dev
Complete
23
0
23
