Secutron MR-2605, Installation Manual

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Secutron Inc. 33
5 Panel Operation
5.1 Operating Sequences
This section describes how the panel functions under various conditions. The choices you
make in panel programming will also affect how the panel operates. Please see Chapter 6
MR-2605 System Programming on page 39 for information on how to program the panel, and
descriptions of each of the programming options.
5.2 General Zone Fire Alarms
Zone alarms have priority over all other annunciation. When an alarm occurs, the following
happens:
• The corresponding zone alarm LED begins flashing, the common alarm LED turns on
steady, and the alarm relay turns on.
• If a trouble was present on that zone then the zone trouble LED turns off. If the trouble
buzzer is audible then it also turns off.
• The NACs sound in a steady or temporal pattern, depending on the option selected (see
6.3.2 NAC Sounding Rate Programming on page 44).
• If enabled, the silence inhibit timer begins counting down (see 6.3.4 Signal Silence
Inhibit Timer and Walk Test Programming on page 46). If the silence inhibit timer is
enabled, the panel cannot be silenced for 60 seconds following the first fire alarm.
Subsequent fire alarms do not restart or extend this timer. While the signal silence inhibit
timer is counting down, if the Silence Alarm button is pressed the panel will sound a 1
second ‘error tone’ on the common trouble buzzer.
• The NACs remain on until silenced with the Silence Alarm button, or if the automatic
alarm silence is enabled, until the thirty minute bell timer runs out (see 6.3.3 NAC
Automatic Signal Silence and NAC2 Strobe Mode Programming on page 45). If the
automatic silence timer is enabled, the panel will automatically silence the NACs 30
minutes after the
last fire alarm. Each zone alarm will restart the timer, giving a full 30
minutes after the last alarm before the NACs are silenced.
• Once the NACs are silenced the signals silenced LED turns on and any flashing zone
alarm LEDs turn on steady. The common trouble LED and trouble relay also turn on
and, if the NACs have been silenced
automatically , the buzzer will sound at a rate of ½
second ON/OFF.
• Any additional zone alarms that occur while the panel is in alarm will reset the auto
alarm silence timer and turn on the NACs, but the panel will not restart the 60 second
silence inhibit timer.
• The zone alarm LEDs, common alarm LED and alarm relay will remain on steady until a
system reset is performed.
Note: A manual signal silence will not initiate the trouble buzzer. Only the common trouble LED and
signals silenced LED are turned on.