Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
8 - 2 Maintenance Issue 13 December 2000
Power Units
Introduction With the exception of a fan failure, the power units are repaired by
replacement.
Fan Maintenance The expected life of the power unit fans at 25°C (77°F) is seven years.
The fans in CPS power units may be replaced in the field without
opening the power unit. When one or both fans fail, the power unit
eventually shuts down as it overheats and issues a power unit alarm and
a thermal alarm.
Two approaches can be taken to fan maintenance. The first approach is
to replace the chassis fan cradle assembly on a routine basis every five
years; this ensures that the fans do not fail in the field under normal
operating conditions. This approach is appropriate when there are no
remote alarm facilities at the site. The second approach, assuming one
has remote alarm capability, is to wait until the fans fail. The power unit
will safely shut down and issue both a fail alarm and a thermal alarm.
The fan cradle assembly can then be replaced. Since it is likely that all
the power units in that installation are of roughly the same age, all power
unit fans at that site should be replaced at that time. The approach used
depends on the convenience of the site as well as the monitoring of
alarms used at the site.
Fan Replacement
Fan Replacement
Step Action
1
Using the Allen wrench provided with each shelf, remove
the power unit from the system.
2
Remove the screw holding the fan cradle assembly onto the
bottom of chassis.
3
Separate the fan cradle assembly from the chassis.
4
Unplug the connectors on the old fans from the power unit.
5
Plug in fan connectors on the new fan cradle.
6
Reattach fan cradle assembly to chassis bottom panel using
one screw.
7
Replace and restore ac service according to the procedures
outlined in Section 5.
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