Envoy 1-4 Zone Conventional Fire Alarm Control Panels Service Manual download pdf (Page 15)

MENV-MINI4-02 Issue2 June 2006

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

(System Healthy

extinguished)

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 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 Detector

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

programing if necessary)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 23 24

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Envoy 1-4 Zone Conventional Fire Alarm Control Panels Service Manual Page 15

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