SEC3002 FIRE ALARM CONTROL PANEL
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T
1
is the amount of standby hours required (most commonly being 24 hours);
T
2
is the amount of alarm hours required (most commonly being half an hour).
Take the system of 324 points with a printer as an example: there are 312 addressable detectors,
12 input/output modules, 12 conventional sounder strobes, 12 loop isolators and 3 full loaded
relay output.
Thus,
I
Lq
= 0.0002 x 312 + 0.001 x 24 = 0.086A,
I
Lmax
= 0.001 x 312 +0.08 x 12 = 1A,
I
Rout
= 0.5 x 3 = 1.5A,
Battery capacity = 1.25 x (24 x (0.3+0.086) + 0.5 x (0.32+1+1.5) +[ (24+0.5) x 0.02 ] )
= 1.25 x (9.264 + 1.41 + 0.49)
= 13.95Ah
7. Maintenance and Troubleshooting
7.1 Maintenance
Periodic maintenance should be carried out on the system as prescribed in the local design,
maintenance and installation regulations.
The key to the panel shall be kept by specially assigned maintenance personnel.
The standby batteries should be periodically checked for integrity of the connections. And a period
of 5 years is recommended to replace the correct type of battery.
7.2 Troubleshooting
Solution of all suspected faults MUST only be carried out by suitably qualified technical engineers.
Problem
: apply power to the panel but the LCD display is off and panel does not work.
Possible reason and solution
: check if the fuse on the PSE Filter blows out; Check if the
POWER indicator on the front panel is on, otherwise something is wrong with the P.S.E that
the manufacturer should be informed.
Problem
: both mains fault and battery fault are reported.
Possible reason and solution
: check whether the power state feedback cable is properly
connected between the IO Board and the P.S.E; It may be due to the reason that the mains is
in fault condition while battery is at low voltage.
Problem
: a fault of loop open is reported.
Possible reason and solution
: check if the connector to the terminal of Loop Out or Loop In
is loose; Check if the circuit between Loop Out and Loop In exists an interruption.
Problem
: a fault of loop short is reported.
Possible reason and solution
: check if the polarized terminals of Loop Out and Loop In are
connected right, that is, ensure the signal from Loop Out (+) is not back to Loop In (-) by
mistake but to Loop In (+); Check if a short circuit exists on the loop and repair.
Problem
: alarm sounders cannot be activated when a fire signal is generated.
Possible reason and solution
: read the specific fault message regarding the sounders and
repair; Make sure sounders are powered by 24V; Check the cause and effect configuration
about sounders activation.