Technical data

22
Envoy Installation, Commissioning & Operating Manual
Fault Finding Chart
The following chart identifies the indications that may be displayed, with the possible cause and the
recommended action. Fault location should be tackled logically by isolating fault paths until the source
is apparent, e.g. disconnecting zone and sounder circuits to prove if the fault is on the circuit or in the
panel, etc. Faults on external circuits can be traced by breaking down the circuit, e.g. placing the EOL
at the mid point of the circuit and determining which half is affected.
Panel
Indication
Possible
Cause
Action
System Fault
+ PSU fault
Mains failure/fuse failure
Battery disconnected or open circuit.
Battery Fuse failed
Voltage too high (>30V) or too low
(<19V)
Check supply / fuse
Check battery / fuse
Adjust to 27.6V. Measure voltage using the battery termi-
nals on pcb, with the batteries disconnected.
System Fault
+ Earth fault
One or more cables in contact with earth Disconnect ext. cables until fault clears. Investigate circuit
and rectify. If fault persists with all circuits disconnected,
then fault is on PCB. Replace. Hint: Remove the pcb to
earth block earth wire, if the fault dissapears then you have
an earth fault. If not the fault is on the pcb.
System Fault
+ Sounder fault
Sounder circuit open circuit (LED slow
pulse) or short circuit (LED fast pulse)
Check circuit integrity/EOL
Sounder not polarised or reverse polarity – correct fault
System Fault
+ Zone Fault
Zone open circuit (LED slow pulse)
Zone short circuit (LED fast pulse)
Confirm fault is on external circuit by disconnecting zone
wires and fitting 4K7R in zone terminals. Check EOL and
circuit connections
System Fault
+ Zone Fault
+ Detector
Removed
One or more detectors removed
Base(s) wired incorrectly
Incompatible detector(s)
Panel faulty
Replace detector(s)
Check wiring/diodes
Consult supplier
Test Mode
+ Zone Fault or De-
tector Removed
System in Test Mode
Reset system to exit test mode
ARW
Illuminates when panel is first
powered up.
Internal microprocessor has auto
reset due to spurious power
surge/interference
Reset panel. If condition
persists, consult supplier
Zone Disabled Zone isolated
Re-instate zone (refer to
programming if necessary)
Supply Healthy extin-
guished.
No other indications
Mains failure & Battery failure Check supply / fuse
Check battery / fuse
Change batteries
Apply Mains