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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 DX 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 DX500 S5/DX600 S5/DX900 S5 have LEDs.
● ETERNUS DX500 S5/DX600 S5/DX900 S5
Figure 65
Batteries
CHG LED
BRDY LED
BTA LED
BCA LED
The states of LEDs are listed below.
Table 32
Status and Meaning of Each LED (Battery)
LED name LED status Meaning
BRDY
(Battery Ready)
(green)
The battery charge rate is 90% or more.
CHG
(Charge)
(green)
The battery is being charged or is ready for discharge.
BCA
(BCU Alarm)
(amber)
The battery is in error status.
BTA
(BTU Alarm)
(amber)
The battery is in error status.
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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.
A. Component Names
Controller Enclosure
242 Configuration Guide (Basic)
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