194
Maintenance & Troubleshooting
Cooling Fan Operational Assessment
• 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
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
, on page 105), 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
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.
Re-apply power to the UCP
-
3901 and restore system operation to see if the fan alarm
becomes inactive.
The UCP
-
3901’s onboard circuitry monitors the fan motor’s rotational speed to detect that
the fan is rotating fast enough to provide sufficient cooling; it raises a fan alarm when the
fan’s rotational speed has gone below a factory-set threshold.
Summary of Contents for UCP-3901
Page 1: ...User Manual 13 03084 010 M00 AB 2020 10 27 UCP 3901 UNIFIED COMPUTE PROCESSOR FOR DENSITÉ ...
Page 18: ...18 Introduction Supported SFP28 Cartridges ...
Page 32: ...32 UCP 3901 Card Installation and Operation Remote control using RollCall ...
Page 36: ...36 Connections and Cabling Cabling to Support SMPTE ST 2022 7 with a UCP 3901 ...
Page 122: ...122 Essence Processing SDC SFP Configuration ...
Page 202: ...202 Maintenance Troubleshooting Keep Fiber Connections Clean ...