Product Manuals/Man-1088_Sigma XT_26 Page 23 of 40
Note: Indication of a mains failure may be delayed by 30 minutes by setting configuration option
2d
15.10 System fault
The System Fault LED will light if the configuration memory has not been set or has become
corrupt.
15.11 General fault
Will illuminate under any fault condition.
This LED will also light if the configuration option jumper (see figure 18) has been left in the
access level 3 position and the enable controls key has been removed from the front panel.
15.12 Lamp test
All LED indicators can be tested at any time by pressing the Lamp Test button. The Enable
Control key does not need to be inserted to test the indicators.
The buzzer can be silenced at any time by pressing the Buzzer Silence button. The enable key
does not need to be inserted to silence the buzzer.
15.13 Hold condition
Activation of the hold input at the connections inside the panel or at a remotely mounted status
unit will cause the Hold Activated indicator to light and the buzzer to sound.
If the control panel is in the 2
nd
stage alarm condition (i.e. it is in Automatic mode and
detection circuits are activated or it is in either Automatic or Manual mode and a
manual release input is operated) then the extinguishant release sequence shall be
halted and the pulsing, 2
nd
stage sounders shall change to 1 second on, 2 seconds off.
Release of the Hold input shall re-start the countdown release timer from maximum.
15.14 Released condition
The released pressure switch input is connected to a pressure switch mounted on the
extinguishant cylinder which operates when the extinguishant has been released. This will activate
the released indicator on the control panel. If the extinguishant has been released by mechanical
means i.e. the control panel is not in the activated condition, operation of the released pressure
switch input will cause the second stage sounders and second stage relay to operate.
15.15 Low pressure switch
The low pressure switch input on the panel is connected to a pressure switch on the extinguishant
cylinder which will operate if the pressure in the cylinder falls below a set point. This will happen
after the extinguishant has been released but may happen before release through a leak. When
this input is operated the Low Pressure Indicator will light, The Fault Relay will operate and the
flooding zone fault indicator will light and the buzzer will sound.
The pressure switch input can be configured as normally open or normally closed via configuration
option C2C (software version 1.2 and above only).
15.16 Test mode
Fire alarm systems must be tested regularly to ensure that they are functioning correctly. The
system can be tested single handed by using a test mode. When in test mode, activation of a fire
alarm will be automatically reset after a few seconds to eliminate the need to return to the control
panel to reset after every activation.
Test mode is entered in a similar way to disablements. With the Enable Control key inserted,
press the Mode button until “t” appears in the first of the seven segment displays. Then press the
Select button until the required zone number appears. Pressing the Enter button will cause the
Test and Zone Fault LEDs to illuminate indicating the zones which are in test mode.
Disablements and zone tests are cleared by repeating the sequence that is used to select them,
i.e. the "db" function (for example) toggles between sounders disabled and sounders enabled.
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