Fault Diagnosis - Kidde Fire Protection ANTARES Manual

4.10.3 Fault Diagnosis

SYMPTOM
PRE-ALARMED LED
illuminated and internal
sounder pulsing.
DEVICE FAULT LED
illuminated and internal
sounder pulsing.
EXTERNAL FAULT LED
illuminated and internal
sounder pulsing. External
sounder not operable.
TM0064
POSSIBLE CAUSE
Analogue value of sensor
increased to a level approx.
midway between normal and
fire threshold.
1. Device removed.
2. Device defected.
3. Open-circuit base/input
cable.
4. Analogue value of sensor
exceeded design parameters.
5. Open-circuit loop.
6. Defective terminal PCB.
7. No 24 V d.c. supply to
relay unit (if fitted).
1. External sounder(s)
defective.
2. Wiring to external
sounder short/open-circuit.
3. Sounder fuses blown.
4. Defective terminal PCB.
5. Loop earth fault.
Page 85 of 91
ACTION
1. Clean sensor and recheck.
2. Renew sensor if systems
persists.
Replace device.
Renew device.
Identify open-circuit and
repair.
Renew analogue sensor.
1. Identify which devices are
beyond the break using the
VFD/LCD.
2. Identify the loop fault by
checking the LED on
terminal PCB.
3. Check continuity device
to device on the loop.
4. Identify open-circuit and
renew.
Renew terminal PCB.
Investigate the cause and
rectify.
Renew sounders.
1. Isolate the sounders from
the alarm loop wiring and
the ALARMS +ve and-ve
leads from the terminal
PCB.
2. Check for continuity
between +ve and -ve leads.
A reading of 4K7 Ω should
be obtained (due to the end
of line resistor). Investigate
the fault if the reading is
correct.
Renew terminal PCB.
3. Identify faulty loop.
4. Locate the earth fault and
rectify.
5. Renew terminal PCB
Issue 2.01