Document: LT0344 Vigilant MX1 Operator Manual
Issue 2.4 8 August 2017 Page 3-1
A fault condition occurs when a system component is in a condition that
may affect its ability to function correctly.
The MX1 continually checks the condition of its internal and external
components, and will generate indications on the front panel and signals
to the fault routing equipment, etc., when it detects a fault.
Examples of faults are:
an MX detector is removed from its base,
a field wiring problem (open circuit, short circuit or signal interruption)
between the MX1 and any of its detectors,
a ground fault between MX1 wiring and earth,
a problem with the power supply or battery.
Generally, all faults are signalled to the fault routing
equipment.
A disabled condition occurs when an operator takes a component out of
service, for example, to prevent a nuisance alarm when maintenance
work such as building repairs or welding is being done in an area, or
because it is faulty and repair may take some time.
A disabled component is prevented from contributing to alarm and fault
indications or outputs. However, since the system is not in a “normal”
state, under most configurations the presence of disabled components is
shown by indications on the front panel.
MX1 uses non-volatile memory to store the disable status for
zones, points, ancillary groups and the alarm devices. If the
MX1 is powered down or restarted within 10 seconds of
disabling or enabling a zone, point, etc., then the new status
may not be stored correctly and the old status will remain.
The LCD will display a message “SYSTEM IS OFF-NORMAL” when any
points are off-normal, but not in alarm or fault. This could be due to a
service error such as:
Alarm routing is isolated,
Database Write Enable link is fitted, etc.
Pressing the NEXT key will display any of-normal points.
The Common Normal (Green) LED will be on if there are no off-normal
conditions, no faults, and no alarms.
Chapter 3
Managing Faults and Disables
Other Off-
Normal
Conditions
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