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Auxiliary input wiring
Two non-latching auxiliary input connections are available to allow external control of sounders:-
Alert Input (ALERT): Operates the sounders intermittently when connected to 0V.
Class Change Input (CC): Operates the sounders continuously when connected to 0V.
If either of the above are triggered, they WILL NOT operate the panel's remote or auxiliary fire outputs.
Figure 7 : Typical auxiliary input wiring
ALERT
Auxiliary output wiring
Five auxiliary open collector output connections are available on the panel, as detailed below:-
Reset Output (RESET): Turns on during the panel's reset cycle. Can be used for resetting fire
alarm system devices such as roller-shutter doors or beam detectors. This output remains active
for approximately one second after all other outputs have returned to normal.
Remote Output (REM): Turns on during any new fire alarm condition or when the panel's Silence/
Activate Sounders button is pressed to manually evacuate the building. The output turns off when
the panel is silenced. This output does not turn on when the Class Change or Alert inputs are
asserted (unless there are other fire alarm conditions present on the system). Note: It is possible
to delay the activation of the Remote Output to correspond with any zone delay(s) that have been
programmed into the panel at Access Level 3. If required, the remote output can be disabled by
the user. When the Remote output is activated the Remote Output light will be lit. This output will
not operate from a non-latching zone.
Auxiliary Fire Output (AUX): Turns on during any fire alarm condition and off when the panel is
reset. This output does not turn on if the Class Change or Alert inputs are asserted or if the
panel's Silence/Activate Sounders button is pressed to manually evacuate the building (unless
there are other fire alarm conditions present on the system). Note: It is possible to delay the
activation of the Auxiliary Output to correspond with any zone delay(s) that have been
programmed into the panel at Access Level 3. If required, the Auxiliary Output can be disabled by
the user. This output will not operate from a non-latching zone.
Fault Output (FAULT): This output is normally energised. When a fault occurs, the output turns
off to ensure failsafe operation even in the event of total power loss. It is important that the
peripheral part of the system this output drives is able to handle the output's 'normally on'
condition. If required, this output can be disabled by the user.
Auxiliary 24V Output (AUX24V): This output provides a positive voltage supply for peripheral
loads (such as relays) which are controlled from the above outputs It is protected by a current
limiting fuse which trips if one or more of the loads are shorted. This affects all loads and results
in appropriate faults being reported at the panel. The current consumed by this output must be
considered when calculating battery stand-by times. DO NOT CONNECT DOOR HOLDER CIRCUITS
TO THIS OUTPUT AS THEY WILL REDUCE BATTERY STAND-BY TIME - USE A SEPARATE POWER SUPPLY.
Figure 8 : Typical auxiliary output wiring
RESET
FAULT
AUX 24V
The wiring for each output should be connected to the relevant 5mm connector block on the Main
Control PCB (see page 13 for more details).
LST700 SERIES INSTALLATION & MAINTENANCE MANUAL • Approved Document No. DFU7002012 Rev 4
CC
0V
AUX
REM
CLASS
ALERT
CHANGE
INPUT
INPUT
–
–
–
+
+
+
FAULT
RESET
REMOTE
RELAY
RELAY
OUTPUT
RELAY
LST700 SERIES FIRE ALARM PANEL
These controls may be used
in schools or workplaces to
provide audible indication of
period changes, e.g., lunch
break start and finish.
To protect the output stage,
only 24V polarised relays
with back EMF diodes
should be used. If any of
the relays are to be used to
–
switch mains potentials,
then suitable relays should
be chosen and installed
and wired accordingly, so
+
as not to compromise the
electrical safety of the fire
AUXILIARY
FIRE
alarm system.
RELAY
9
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