Chapter 4: Subsystem Operation and Monitoring
Status Indicating LEDs
4-13
1.
The temperature sensor embedded with the charger circuit
reports a temperature reading exceeding 35 degree Celsius.
2.
The BBU (battery backup unit) 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.
4.4.9 PSU LEDs
Each PSU module has one (1) LED located on the left-hand side. The other
two vertically aligned LEDs are cooling fan failure indicators. (See
Figure
4-8
) Please refer to
Table 4-7
for PSU LED definitions.
Figure 4-8: PSU Module LED
