Chapter 3 Subsystem Monitoring
IMPORTANT!
In addition to BBU failure itself and the charger failure, the subsystem may
also light the BBU fault LED when the following occur:
1.
The temperature sensor embedded with the charger circuit reports a
temperature reading exceeding 45 degree Celsius.
2.
The BBU (battery cell pack) has been charged for over 7 hours. The BBU
charger will enter a timer fault state.
When the above conditions occur, the charger circuit will enter a low-power
and self-protection state.
You
may
correct
the
faults
when
receiving
a
BBU Thermal
Shutdown/Enter Sleep-Mode!
event message:
1.
Check proper ventilation within the subsystem.
You may also check the
readings from other sensors within the enclosure. Airflow might have
been disrupted by the absence of one or several major modules or the
failure of a cooling fan. Once the thermal condition is improved, charging
will resume automatically.
2.
If a new battery module has been charged for over seven (7) hours and
this event is issued, you may remove and re-install the battery module. An
empty battery module may take more than 7 hours to be fully charged.
There is a timer embedded with the charger, doing so can reset the timer.
Charging will resume automatically.
3.2.7
PSU Module LED
Each PSU module has one (1) LED located just above the power switch and just
below the retention screw to indicate the operational status of the PSU module. (See
Figure 3-6
) Please refer to
Table 3-7
for PSU LED definitions.
Figure 3-6: PSU Module Rear LED
Status-indicating LEDs
3-7