Figure 22 Batteries; Table 18 Status And Meaning Of Each Led (Battery) - Fujitsu ETERNUS AF S3 Series Basic Operation Manual

A. Component Names
Controller Enclosure
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Batteries
Batteries are used for backup power source in case of power outage. A controller enclosure has two batteries.
The batteries are charged from an external power source while the ETERNUS AF is running normally. If a power
failure is detected, the cache data in the system memory is saved to the BUD in the controller by using battery
power. There is no limit to the post-failure data retention time.
Batteries for the ETERNUS AF650 S3 have LEDs.
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ETERNUS AF650 S3
Figure 22
The states of LEDs are listed below.
Table 18 Status and Meaning of Each LED (Battery)
LED name
BRDY
(Battery Ready)
CHG
(Charge)
BCA
(BCU Alarm)
BTA
(BTU Alarm)
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BUD
A BUD is non-volatile memory in which the firmware is registered. A BUD is used as an area to back up cache
data in the system memory if a power failure occurs.
Batteries
BRDY LED
CHG LED
BCA LED
BTA LED
LED status
(green)
(green)
(amber)
(amber)
Meaning
The battery charge rate is 90% or more.
The battery is being charged or is ready for discharge.
The battery is in error status.
The battery is in error status.
81 Operation Guide (Basic)