• If either of the matrix’s two cooling fans stop operating.
• If the temperature inside the matrix exceeds a set threshold.
5.7.2.1 Alarm reset button
When the alarm reset button is pressed the following events take place, even if
the alarm condition has not been corrected:
• The internal audible alarm buzzer stops buzzing.
• Any wired relay contacts return to their inactive state. If these relays are
connected to external alarm lights or alarm buzzers, those lights or
buzzers shut off.
• If the original alarm condition still exists, the red main alarm light on the
matrix’s front panel continues to flash. The red main alarm light only
stops flashing when all original sources triggering the alarm are
corrected.
• If a new alarm condition or conditions occur before the original alarm
conditions are corrected, the internal buzzer and relay contacts will not
reactivate. They will only reactivate after all original alarm conditions are
corrected.
5.7.2.2 Main alarm light [Alarm]
An alarm source triggers the red main alarm light [Alarm] and also one of the
additional, specific red alarm lights, allowing you to identify or correct alarm
conditions before they affect the operation of the matrix (see below).
An audible warning (buzzing) is also given.
Note: Any installed alarm relay outputs switch to active (the normally open contact
closes and the normally closed contact opens). When the alarm relay activates,
it can cause an externally connected device like a light or buzzer to switch on.
5.7.2.3 CPU card alarm light [Config Alarm]
When lit, the CPU card [Config Alarm] red alarm light indicates a CPU card
failure.
5.7.2.4 External alarm light [Ext Alarm]
When lit, the red external alarm [Ext Alarm] light indicates that an external
alarm has triggered the external alarm input. The external alarm is connected to
the matrix through the 9-pin D-type connector on the matrix’s rear panel labeled
Alarm I/O.
5.7.2.5 Temperature warning light [Overtemp]
When lit, the red temperature warning light [Overtemp] indicates that the
matrix is above the maximum operational temperature limit and is in danger of
overheating (for the acceptable temperature range, see 15.3 Environmental in
this document)..
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