Fault Indication - C-TEC AVAC Installation And Maintenance Manual

AVAC VOICE ALARM SYSTEM

FAULT INDICATION

When a fault occurs, an intermittent fault buzzer sounds at AVAC and the relevant fault indicator illuminates.
The fault relay also activates to report the fault to the fire detection system where, depending on the wiring
configuration used, it is usually reported as a sounder fault.
Pressing the Silence Internal Sounder button on the front of AVAC will mute the fault buzzer. However,
as all faults are also reported to the host fire detection system, removing link PLK5 (located below the buzzer
on the Main PCB) will permanently disable the fault buzzer. Be sure to check with the approving authority
that disablement of the internal sounder is acceptable before removing this link.
All faults should be recorded in the fire detection system's log book and appropriate action should be taken
to correct them. An explanation of what each indicator means and the steps that can be taken to correct
the faults they relate to can be found below. Note that all faults (except system faults and amplifier faults)
are non-latching so when the fault is cleared, provided no other faults are present, the fault buzzer and all
relevant fault indicators will clear.
PSU fault
Illuminates when one or more of the following has
occurred:
1) The battery fuse has blown.
2) The battery supply voltage is too low.
3) The battery charging circuitry is faulty.
4) The switch mode power supply is faulty.
5) The 24V output on the main PCB is shorted or overloaded.
See also section 1.1 on page 27.
Mains fault
Illuminates when the mains has
failed or the primary mains fuse
has blown. Note that when this
light is lit the system will only
operate for the standby period
dictated by the size of the
backup batteries fitted and to
conserve battery life, BGM and
public address paging is
suppressed.
System fault
Illuminates when one or more of
the following has occurred:
1) The microprocessor has reset.
2) The main PCB is faulty.
These types of fault can only be
cleared by pressing the Reset
button (SW2) on the indicator
PCB inside the panel.
If the fault reoccurs
the Main PCB may be
faulty. See also
section 1.2, page 28
General fault
Flashes when there is a
fault on any part of the
voice alarm system.
This light is always lit in
tandem with at least
one other fault light
which will convey more
precise information on
the type of fault
detected.
AVAC Installation and Maintenance Manual • Approved Document No. DAU0000402 Rev 6 • Page 26
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AVAC
- Life Safety Voice Alarm System
supply fire
present microphone
mains psu microphone
fault fault fault
('master fault'
on Slave AVACs)
system general slave
fault fault fault
Silence internal
Sounder
Slave fault
(this indicator does not
appear on slave AVACs)
Illuminates when one or
more of the following has
occurred:
1) There is a fault on any
(optional) slave(s) that are
connected to the master -
refer to the slave(s) for
more precise details of the
fault.
2) There is an open or
short circuit fault on the
slave wiring.
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Microphone fault
(on master AVACs)
Illuminates when one or more of the following has occurred:
1) The emergency microphone is faulty
2) There is an open or short circuit fault on the fire mic. wiring
3) The master fire mic. link (PLK2) is not fitted at the last AVAC
to which it is connected.
Master fault
(on slave AVACs)
Illuminates when one or more of the following has occurred:
1) The master AVAC is faulty
2) There is an open or short circuit fault on the master to slave
wiring
3) The master fire mic. link (PLK2) is not fitted at the last slave
AVAC in the master to slave chain.
Message Store
evacuation alert test
message fault
A B standby speaker A
fault fault fault fault
Amplifier & Speaker faults
Designed to comply with BS5839 : Part 8 : 1998
A fault, B fault and/or
standby fault
The relevant amplifier fault
indicator illuminates if
there is a problem with any
of the amplifiers (A, B or
standby). Note that the
standby amplifier is option-
al. If any of these indicators
are lit, try pressing the
Reset button (SW2) on the
indicator PCB inside the
panel to see if the fault
clears. If the fault does not
or if the fault comes back
soon after, refer to Section
1.3 on page 28.
paging
active
Message fault
(this indicator does not
appear on slave AVACs)
Illuminates when there
is a problem with the
digital message store.
Check that the Digital
speaker B
Message Store PCB is
fault
plugged in correctly. If
it is and the fault mes-
sage reoccurs the PCB
may be faulty.
Speaker fault A
Speaker fault B
& EN 60849 : 1998
The relevant speaker fault indicator
illuminates when one or more of
the following has occurred:
1) There is an open or short circuit
fault on a speaker circuit.
2) The speaker circuit's end of line
device is missing.
3) There is a speaker earth fault.
To ascertain if there is an earth
fault, open the AVAC and check to
see if either of the speaker earth
fault lights on the Main PCB inside
the panel are lit. If they are not, the
fault is an open or short circuit.
Have you calibrated the
speaker circuits (see page
16)? Failure to do so could
also lead to speaker circuit faults
Refer also to section 1.3 on page 28.