Installation and Configuration 3
Man-1453 Rev.01
Sigma ZXT SI Product Manual
10
Modes Select Key-Switch
Some models of the Status Units have a ‘Mode Select’ key-switch. The key can be removed in either position. The
operation of the Mode Select key-switch is as per the Mode input above.
Manual Release
Some models of the status units are fitted with a ‘Manual Release’ push-button. This replicates the action of the man-
ual release control at the main Control Panel and once activated will start the extinguishant release sequence.
A plastic seal is provided in the accessory pack and should be fitted to the manual release flap with a piece of thin
wire to provide an indication if the Manual Release has been tampered with.
Processor and Watchdog Reset Switches
The status unit is controlled by a microprocessor, which will re-start itself and continue to run if it stops.
To ensure that the unit is not being subjected to continual, undue interference which may effect its proper operation,
a CPU fault indicator is latched on and a fault condition signalled to the Control Panel.
If a processor re-start has occurred, this latched fault condition will need to de reset by pressing the WDOG RESET
button on the bottom of the PCB.
A switch is also provided to manually re-start the processor PROC RESET. This switch can be used while connected
to the system to ensure that unit starts and establishes communication with the Panel in a controlled and expected
manner.
Figure 3-8
Processor and Watchdog Reset Switches
Processor Reset
Watchdog Reset
