Clear-Com LMC-64 - Manual (Page 37)

Clear-Com
Eclipse Median Instruction Manual 2 - 1 7
AUXILIARY ALARM LIGHTS
When an alarm condition occurs, any of the six auxiliary alarm lights
may switch on, in addition to the main alarm light, to help diagnose the
alarm condition. The following sections describe the six auxiliary alarm
lights.
External Alarm (“Ext Alarm”)
The “external” alarm (labelled “EXT ALARM”) light switches on to
indicate that an alarm condition has triggered the built-in relay outputs
to turn on any externally installed alarms such as lights or bells. You
connect the external alarm to the matrix through the 9-pin D-type
connector on the matrix’s rear panel labeled “Alarm I/O”.
Temp Alarm
The red “temp” alarm light switches on to indicate one or both of the
following:
• The active CPU card has detected a temperature in the matrix above
a threshold.
• One of two CPU cards has been removed from the matrix.
Note that this feature only operates if there are two CPU cards
installed in the matrix. If there is only one CPU card, the Temp
alarm light does not switch on if the card is removed.
Fan-Fail Alarm
The red fan-fail alarm light illuminates when either fan in the
power-supply module stops rotating correctly.
PSU1 Fail
When the first power supply unit is operating correctly, the red PSU1
light stays off, while the four green power supply lights (+12V, +5V,
+3.3V, -12V) stay on continuously.
If a DC output or AC input to the first power supply drops too low, the
red PSU1 light switches on. The amber (HITRON) or red (Power-One)
light on the power supply unit itself also switches on to indicate the
same condition. One of the green power supply lights may then switch
off to help indicate the source of the trouble.
Note that the PSU1 fail light only works if the first power supply is
plugged into the matrix’s midplane from inside the matrix.
Note: A temperature sensor inside the power supply senses if the
power supply overheats, and switches on the second
matrix cooling fan. The red “Temp” light switches on to
indicate that the active CPU card, not a power supply, has
overheated.