FirePro Sigma XT Installations- und Betriebshandbuch - Seite 9

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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 for any reason such as severe

electrical interference such as an electrical storm.

To ensure that the unit is not being subjected to continual, undue

interference which may affect 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 be 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 the status units are connected

to the system to ensure that the unit starts up and establishes

communication with the panel in a controlled and expected manner.

Internal fault indications

An extinguishant fault indication at the control panel may mean that there are faults at one or more status

units. The status unit fault indications are located along the bottom of the PCB and are as follows:

4.8.1.

COM

This LED indicates that the data communications connection to the control panel is not present. This may be

because the data lines are connected with reverse polarity or are not connected. Check RS485 IN and OUT

connections.

4.8.2.

LOCK OFF

This LED indicates that the Lock Off input is open or short circuit. Check that the correct end of line resistor is

connected to the Lock Off terminals or at the end of the wires connected to the Lock Off terminals and that the

Lock Off input is not short circuited, or the wiring open circuited.

IMPORTANT NOTE: When there is a fault on the Lock Off input then the Lock Off function is invoked which means that the

extinguishant release will not operate until this condition is cleared.

4.8.3.

MOD

This LED indicates that the MODE input is open or short circuit. Check that the correct end of line resistor is

connected to the MODE terminals or at the end of the wires connected to the MODE input and that the MODE input

is not short circuited.

4.8.4.

FUSE

This LED indicates that the electronic fuse has operated. Under this condition, the status unit is not operational.

This may be due to incorrect polarity of the power connection or a failure on the unit itself.

Sigma_XT_signs_m3.5.docx

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