Nevion Flashcase-II model 1 - Manual (Page 12)

FlashCase-II model 1 Rev. A
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5.3 Alarms, required actions
Required actions when a fan alarm is present are dependent on the incident with regard to
power load and environmental temperature.
5.3.1 Fan alarms
5.3.1.1 One fan alarm
Load status Ambient
temperature
Expected
consequences
Required actions
<= 50% (<= 20W) Within spec. None, the operation
may be completed
undisturbed Replace the
defective fan when
operation is
completed
Within spec. <= 25°C None, the operation
may be completed
undisturbed Replace the
defective fan when
operation is
completed
>50% (> 20W) > 25°C The Flashlink modules
will function for a
period of uncertain
duration depending on
the margins with
regard to ambient
temperature and
power load. Replace defective
fan as soon as
possible.
NOTE:
Replacement may
be performed while
the unit is fully
functioning by
releasing the
chassis/backplate
from the profile.
Table 1 Fan alarm, action plan
The above table is the suggested action plan. Actual results are dependent on factors such
as:

The condition of the Flashlink modules

Actual bit rate

Transmission margins
5.3.1.2 Two fan alarms triggered simultaneously
This indicates a serious failure in the fan power circuit, and the unit should be repaired as
soon as possible.
The Flashlink modules will function for a period of uncertain duration depending on the
margins with regard to ambient temperature and power load.
5.3.2 Voltage alarms
5.3.2.1 Internal voltages
A voltage below the lower threshold may indicate an overload incident and should be
investigated.
A voltage above the upper limit indicates an error at the internal power board which should
be repaired/replaced.
5.3.2.2 External voltages
The defective power supply should be replaced.