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Operating Instructions
156 MS-9200UDLS PN 52750:E1 01/27/09
SECTION 4 Operating Instructions
4.1 Panel Control Buttons
4.1.1 Acknowledge/Step
The first press of the Acknowledge/Step key silences the piezo sounder, changes
flashing 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 key functions
as described in the preceding paragraph. Subsequent pressing of the key 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 key performs the same functions as Acknowledge/Step. In addition,
if an alarm exists, it turns off all silenceable NACs (Notification Appliance Circuits)
and causes the Alarm Silenced LED 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 LED is turned off by
pressing the Reset key, the Drill key or subsequent activation of the NACs.
4.1.3 Drill/Hold 2 Sec
When the Drill key 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 LED 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 key can be used to turn off all silenceable NAC outputs
following activation by the Drill key.
4.1.4 Reset
Pressing and releasing the Reset key 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 LEDs (except the Ground
LED), piezo sounder and LCD display segments after the Reset key is released. Any
alarm or trouble that exists after a reset will resound the system.