GRASS VALLEY IQUCP25, User Manual

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UCP - 3901
MV SDC Chapter User Manual
cause unexpected behavior such as glitches or even a system freeze or shutdown. The
UCP - 3901 self-diagnoses high temperature conditions by raising critical temperature and
fan alarms.
Critical temperature and fan alarms are reported through the following mechanisms:
• The fan and critical temperature alarms are reported in RollCall in the Alarms
Configuration panel. For this, the Fan Status Check alarm must be enabled. See
Logging - System , on page 140 for more information.
• A UCP - 3901’s Densité status LED flashes red due to this condition (note that the Status
LED can also flash due to other conditions).
The fan alarm indicates that the fan:
• Is not rotating fast enough due to wear and thus it may not provide enough cooling.
• Has become unplugged from Power Connector
J14 . See Cooling Fan Replacement
Procedure , on page 322.
A fan alarm must be addressed right away. A critical temperature alarm can be ignored if it
is accompanied by a fan alarm as the root cause is the fan not rotating fast enough.
Otherwise, if the fan is running properly according to the fan alarm, then the
Critical
Temperature Alarm Corrective Actions steps should be taken.
Critical Temperature Alarm Corrective Actions
If the fan alarm is inactive and the critical temperature alarm is active (see TEMP_N_STATE=
in Logging - FPGA , on page 153), then undertake the following diagnostic steps in the
following order:
1 Confirm that the room temperature is within UCP - 3901’s operating temperature range
specification. If necessary, take corrective actions by, for example, increasing the
amount of air conditioning made available to the Densité frame.
2 Confirm that air flow around the Densité frame is not obstructed. If necessary, take
corrective actions by, for example, removing obstructions or rerouting cables around
and away from the Densité frame.
3 When the previous corrective actions do not eliminate an critical temperature alarm,
verify that the UCP - 3901’s onboard fan is working correctly. See Fan Noise below.
Fan Noise
Over time, a fan’s performance (operating speed) can degrade which may raise critical
temperature and fan alarms. Under this circumstance, a fan may emit a rough-sounding
lower pitched sound as compared to the sound that other healthier fans emit. To confirm
that the UCP - 3901 has an abnormally-sounding fan, during off hours when the system is
not in use, eject the UCP - 3901 card from the frame to verify that the distinctive sound stops
and take corrective actions (see below).
Fan Alarm and Fan Noise Corrective Actions
When a fan alarm is raised, it must be addressed right away. During off hours when the
system is not in use, eject the UCP - 3901 card from the frame and inspect the UCP - 3901’s fan
assembly: remove any accumulated dust and dirt from within the UCP - 3901 with
compressed air and remove any obstruction to the fan’s ability to freely rotate.