Operating Instructions; Panel Control Buttons; Acknowledge/Step; Alarm Silenced - Honeywell MS-5UD Series Manual

Operating Instructions

SECTION 4

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
(TROUBL to Troubl). 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. The Acknowledge key will have no effect on the Notification Appliance
Circuits.
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 active
event.

4.1.2 Alarm Silenced

The Alarm Silenced key performs the same functions as Acknowledge/Step except it will not step
through each event when multiple events are present at the panel. If an alarm exists, the Alarm
Silenced key 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. The Alarm
Silenced LED is turned off by pressing the Reset key, the Drill key or subsequent activation of the
NACs.
Note that if Silence Inhibit has been enabled, NACs cannot be silenced for one minute following
initiation of an alarm.

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 all NAC outputs 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 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,
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.
Note that if Silence Inhibit has been enabled, the FACP cannot be reset for one minute following
initiation of an alarm.
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Operating Instructions
MS-5UD/MS-10UD Series PN 52626:B 8/01/2008