Chapter 5 Subsystem Maintenance and Upgrading
BBU failure can result from the following:
1.
A BBU (battery cell pack) has lost its ability to hold electrical
charge. This may be the case after the battery cells have been
recharged for many times regardless of how long the module has
been used. Therefore, a stable power source is important for
system operation.
2.
The charger circuitry mounted underneath the controller top cover
has failed.
There are other conditions that might trigger the BBU fault events and light the BBU
fault LED:
1.
The temperature sensor embedded with the subsystem’s charger
circuit reports a temperature reading exceeding 45 degree Celsius.
T
he charger circuits will enter a low-power and self-
protection state.
2.
A BBU module has been charged for over seven (7) hours.
A
timer is embedded with the charger. When this occurs, the
charger will enter
a timer fault state.
The fault condition
usually occurs with a brand new BBU or with a totally
discharged BBU. Charging will resume automatically if you
remove and re-install the BBU module.
To replace a BBU module, please follow these steps:
Step 1.
Remove the BBU module from the subsystem
by loosening its
spring screw, and then gently removing the module from the
chassis.
Figure
5
-4: Removing the BBU Module
Replacing a Failed BBU Component
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