Alarm Lights and Alarm Reset Button

The following conditions trigger an alarm:

  • If any of the voltages produced by the first external power supply unit fall below normal levels.

  • If any of the voltages produced by the second external power supply unit fall below normal levels.

  • If an internal matrix alarm condition activates a matrix relay to turn on an external alarm.

  • If the PSU exceeds a temperature threshold.

  • If either of the CPU cards is removed from the matrix.

  • If either of the matrix’s two cooling fans stop operating.

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.

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.

CPU card alarm light [Config Alarm]

When lit, the CPU card [Config Alarm] red alarm light indicates a CPU card failure.

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.

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 Environmental).

Internal PSU failure light [Int PSU Fail]

When lit, the red internal PSU failure light [Int PSU Fail] indicates that the internal power supply has failed.

External PSU failure lights [Ext PSU Fail (1/2)].

There are two external PSU failure lights, one for each of the twin external 12V power supplies.

When lit, the red warning light indicates that the external power supply has failed. If both lights are lit, both the power supplies have failed.

Fan failure lights [Fan Fail (1/2)].

There are two cooling fan failure lights, one for each of the two cooling fans in the matrix.

When lit, the red warning light indicates that a fan has failed. If both lights are lit, both the fans have failed.