Programming and Operating 4
Shield Fire, Safety and Security Ltd.
Shield A-XT Releasing Fire Control Panel - Installation and Operation Manual SEXTCP-OM
Revision E01.00
46 of 127
Control Operation
The table below describes control operation of the Shield A-XT Releasing Fire Control Panel:
Single Zone Fire Condition
Upon receipt of a fire condition by activation of a detector or pull station, the Common Fire indicator will light and the
zonal Fire indicators will flash at around 2Hz. The fire and local fire relays will also operate and signal any systems to
which they are connected. Any annunciators connected to NAC1 and NAC2 will operate. If the zone that has activated
is contributing to the extinguishant release sequence, the First stage activated LED will light and the first stage relay
contact will operate.
Controls Operation
Terminate Release Press the Terminate Release button while in Access Level 3 to terminate the flow
of extinguishant caused by a releasing event and reset the fire control panel. The
flow of extinguishant can not be stopped using the reset button until after the
extinguishant duration timer has elapsed.
W / Dog Reset Press the W / Dog Reset button to clear the watchdog event. The watchdog event
causes a reset when the fire control panel fails to carry out an operation.
The following conditions occur during a watchdog event:
• The General Trouble and System Trouble LEDs light in the General System
Status area of the upper indicators.
• The CPU Trbl. (trouble) LED lights on the lower indicators of the fascia.
• The internal buzzer of the fire control panel sounds.
Processor Reset Press the Processor Reset button to reset the function of processors in the Shield
A-XT Releasing Fire Control Panel. Perform this task to restore normal oper-
ation to the fire control panel. The fire control panel will resume normal operation
within seconds of pressing the processor reset button. This task is not a typical
function of the fire control panel and is only necessary when controls and indica-
tors are unresponsive. Press the Processor Reset after a firmware upgrade to re-
initialize processors in the fire control panel.
Exting. Mon. Potentiometer used for calibrating the releasing circuit.
Reference the Releasing Calibration area of this section for further information.
Write Enable
To operate the Write Enable switch:
1 Turn the Enable Access key to the right to open Access Level 2.
2 Move the slide-switch to the right to select Access Level 3.
Place this switch in the Write Enable position when programming in Access
Level 3.
3 Return the slide-switch to the non-Write Enable position after completing
tasks in Access Level 3.
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