EP203 AUTOMATIC EXTINGUISHER PANEL
Page 36 of 45 • EP203 AUTOMATIC EXTINGUISHER PANEL INSTALLATION MANUAL • Approved Document No. DFU0002032 Rev 4
Sounder Faults
All three alarm sounder circuits are monitored for open and short circuit faults (unless
disabled, or in an alarm condition).
An open, or short-circuit fault on a sounder circuit is indicated by the following:
•
Internal panel sounder activates
•
General Fault yellow LED flashes
•
Sounder Fault yellow LED flashes
•
LCD unit displays the specific fault (e.g. Sounder circuit 1 O/C fault, Sounder
circuit 2 S/C fault).
To de te r m i ne w h ic h o f t he pa ne l ’ s t h ree s o un de r c i rc u i t s i s fa ul t y
1.
Disconnect each sounder circuit from the Main Control PCB in turn and measure the
resistance between the two wires. A healthy circuit will display only the end-of-line
resistor value. Any other resistance value signifies a fault.
2.
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 terminals. If the fault persists,
the Main Control PCB is faulty and must be replaced.
3.
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.
Powe r Supply Faults
Note : The power supply status can be viewed at Access Level 3, selecting the
Engineering menu, then selecting Show PSU Stats.
When a power supply fault occurs the LCD unit displays the specific fault and the Power
Supply Fault yellow LED flashes. A power supply fault arises when one, or more of the
following conditions have occurred:
•
The mains supply voltage is too low, or has failed completely
•
The mains supply fuse (F1) has ruptured
•
The battery fuse (F2) has ruptured
•
The battery supply voltage is too low
•
The Power Supply PCB is faulty.
The following lists typical fault diagnosis for power supply faults:
The ma i ns s up p l y v ol ta ge i s t o o l ow , o r ha s fa i le d c o m ple te l y
S y m p t om s : The EP203 panel is running on batteries, but NOT on mains supply.
The LCD unit displays ‘Mains=FAIL’ and the Hazardous Voltages Present red LED on the
Power Supply PCB is lit steady.
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