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SECTION 4
4.1 Panel Control Buttons
4.1.1 Acknowledge/Step
The first press of the Acknowledge/Step button silences the piezo sounder, changes flashing
indicators/LEDs to steady and also changes the status field on the LCD display from capital letters
to small letters. When the piezo is silenced, an acknowledge message is sent to the printer and the
history file. Acknowledge also sends a silence piezo command to the optional annunciators
connected to the FACP.
When more than one event exists, the first press of the Acknowledge/Step button functions as
described in the preceding paragraph. Subsequent pressing of the button steps through each off-
normal active event, with alarm events having a higher priority than trouble and supervisory events.
4.1.2 Alarm Silence
The Alarm Silence button performs the same functions as Acknowledge/Step. In addition, if an
alarm exists, it turns off all silenceable NACs (Notification Appliance Circuits) and causes Alarm
Silenced indicator to turn on. It also sends an 'alarm silenced' message to the printer, history file
and optional annunciators. A subsequent new alarm will resound the system NACs. Note that the
Alarm Silenced indicator is turned off by pressing the Reset button, the Drill button or subsequent
activation of the NACs.
4.1.3 Drill/Hold 2 Sec
When the Drill button is held for a minimum of two seconds (time required to prevent accidental
activations), the FACP turns on both main panel NAC outputs and all silenceable circuits such as
control modules that are programmed as silenceable, and turns off the Alarm Silenced indicator if it
was previously on. The EVAC IN SYSTEM message is shown on the LCD display. The same
message is sent to the printer and history file. The Alarm Silence button can be used to turn off all
silenceable NAC outputs following activation by the Drill button.
4.1.4 Reset
Pressing and releasing the Reset button turns off all control modules and NACs, temporarily turns
off resettable power to 4-wire detectors, causes a RESET IN SYSTEM message to be displayed on
the LCD and sends the same message to the printer and history file. It also performs a lamp test by
turning on all indicators/LEDs (except the Ground LED), piezo sounder and LCD display segments
after the Reset button is released. Any alarm or trouble that exists after a reset will resound the
system.
MS-9050UD PN 52413:C 01/23/08
Operating Instructions
Operating Instructions
147
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