Quadnet Control Panel Engineering and Commissioning Manual
57
15.
Earth fault
Remove the s/c to earth
The control panel has detected a short circuit to earth from one of its
supply rails (either 0v or +ve).
Remove the circuits connected to the control panel one at a time and
reset the system. When the circuit with the earth fault is disconnected, the
earth fault will clear within approx 30 seconds of being reset.
A short circuit (low resistance expected less than 5k) may be identified
and tracked with an electronic test meter between either the positive core
or the negative core and the screen of that circuit.
It is not possible to override the earth fault monitoring as it is important for
correct system operation.
16.
Heat sensor failed
(OC)
Replace the device
A Multipoint detector has detected an open circuit in its thermistor
circuitry.
As this circuit is important even for the operation of the smoke detection
modes, the device should be replaced.
17.
Heat sensor failed
(SC)
Replace the device
A Multipoint detector has detected a short circuit in its thermistor circuitry.
As this circuit is important even for the operation of the smoke detection
modes, the device should be replaced.
18.
Initialization stopped
at device xxx
(this
message does not
appear but the loop
initialisation screen
stops with a “x” next to
the number of the last
device initialised)
Investigate the last point
initialised
Whilst initialising the addressable device loop, the control panel was
unable to sense a complete loop from Loop End 1 returning to Loop End
2.
Stop the loop, wait at least 3 minutes and then reinitialise to ensure
repeatability, then investigate the last device found (indicated by xxxx)
and the following device. If no faults can be found try temporarily linking
out that device to see if initialisation will pass that point, thus the device
may need replacing.
19.
Loop not initialised
Initialise the loop
The addressable circuit has not been correctly initialised. Check that the
number of devices found matches the number of devices on the system.
20.
Loop low resistance
Investigate the loop for
short circuit
A low resistance has been detected between the +ve and the –ve core of
the addressable device circuit.
This has not yet developed into a measurable short circuit, but steps
should be taken to rectify the condition before it worsens. Introducing a
split into the loop and then initialising from one end only will help to
identify the location of the problem.
21.
Loop stopped
Initialise the loop
The addressable device circuit had been stopped and the devices are
inactive.
22.
Mains failed
Reinstate the mains
supply
The incoming AC supply has been removed.
Check the supply voltage of approx 230V AC at the panel AC input
terminals, and that the fuses in that circuit are intact.
23.
Node xxx reset
Replace the device
The device has reset itself.
Check in the event log to see if it is occurring regularly, and if so change
the device.
24.
Open circuit at
position xxx
Investigate the loop for
+ve open circuit
An open circuit has been detected in the +ve core of the addressable
device circuit between the device indicated and the next.
Check connections and cable in that area, stop the loop, wait at least 3
minutes and then reinitialise the loop. If it occurs again the device should
be changed.
Please note that fixing the open circuit without stopping and reinitialising
the loop will not clear the fault and will reduce the system’s ability to deal
with a second open circuit fault elsewhere in the wiring.
