Repeater Faults; Sounder Faults; Fault, Remote Or Auxiliary Output Faults - ADEMCO LST700 Series Insallation & Maintenance Manual

LST700 SERIES FIRE ALARM PANEL

1.4 Repeater faults

■ To find out which of the repeater panels are faulty:-

1.5 Sounder faults

■ To determine which of the panel's four sounder circuits are faulty:-
1.6 Fault, remote or auxiliary fire output fault
If the panel's 24V auxiliary output, which is typically used to supply relays switched by the fault, remote
and auxiliary outputs, is subject to current overload, its protection fuse will trip. This will result in the
fault, remote and auxiliary fire outputs showing a fault condition by flashing their respective lights.
Repairing the fault will reset the fuse, and clear the associated fault indicators.
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1. Remove the panel's lid using the torx key provided and press the ACCESS LEVEL THREE
FUNCTIONS button on the Main Control PCB to gain access to the panel's engineer functions
(see below).
SYSTEM
REPEATER
FAULT FAULT
SW8
COINCIDENCE
ACCESS
LEVEL THREE
FUNCTIONS
2. Continue pressing the ACCESS LEVEL THREE FUNCTIONS button until the REPEATER FAULT light pulses.
Any existing zone fault indicators are suppressed and the zone indicator(s) corresponding to
the repeaters in fault are illuminated. For example, if repeaters 2 and 7 are faulty, the fault
indicators for zones 2 and 7 will be lit.
To escape access level three press the ESCAPE ACCESS button at any time.
Suggested action: Refer to the Repeater Panel Instructions for repeater fault-finding advice.
(a) Disconnect each sounder circuit from the Main Control PCB in turn and measure the
resistance between the two wires. A good circuit will present only the end of line resistor
value. Any other resistance value shows a fault.
(b) If the readings from all sounder circuits are correct, take their End of Line resistors and
connect them to the sounder circuits at the panel without the sounder circuit wiring. If the Fault
still persists, the panel is faulty and must be replaced.
(c) If a sounder circuit fault is detected, correct the fault and reconnect the sounder circuit. The
sounder fault will automatically clear within 60 seconds.
Note: If the sounder circuit is shorted and the alarm voltage applied, the relevant sounder fuse
will trip. When the fault is removed, the fuse will automatically reset.
LST700 SERIES INSTALLATION & MAINTENANCE MANUAL • Approved Document No. DFU7002012 Rev 4
OPEN SHORT
CIRCUIT CIRCUIT
DELAYS TEST
NONLATCHING