May 2001
System Hardware Manual 2 - 29
A6-324000-642-01 – Release 4.0
May 2001
4.7.2 Memory Backup
A backup battery is equipped on several of the ETU’s. This
battery retains the system’s memory in the event of an
extended mains power failure where the system backup
batteries have also expired or where the ETU has been
removed from the system.
Table 2-11 External Backup Battery Requirements
Battery
Capacity (Ah)
Backup Duration
Xen Axis
(Max. 1.0A, 230W)
Xen Master
1 Cabinet
(Max. 1.3A, 320W)
Xen Master
2 CabinetS
(Max. 2.0A, 460W)
Xen Master
3 Cabinets
(Max. 2.9A, 690W)
1 hour 4.0 5.2 6.8 8.8
2 hours 8.0 10.4 13.5 17.6
3 hours 12.0 15.6 20.3 26.4
4 hours 16.0 20.8 27.0 35.2
5 hours 20.0 26.0 33.8 43.9
6 hours 24.0 31.2 40.6 52.7
7 hours 28.0 26.4 47.3 61.5
8 hours 32.0 41.6 54.1 70.3
9 hours 36.0 46.8 60.8 79.1
10 hours 40.0 52.0 67.6 87.9
Note 1: The system requires a 24Vdc battery feed and so two 12 Vdc batteries for the quoted capacity
will be required.
Note 2: The figures are based on a fully located system operating throughout the power loss. Backup
durations for an idle system will be approximately twice the quoted figures.
Note 3: Use only Sealed Lead Acid type batteries and always install batteries in accordance with the
relevant regulations.
Table 2-12 ETU Battery Backup Specifications
ETU
Battery
Specifications
Quantity
Approx.
Backup Time
Replacement
Time
CPUB( )-U13 ETU 3.7V, 60mAH Ni-Cd 1 21 days 2 Years
MBD-U13 UNIT 3.7V, 60mAH Ni-Cd 1 21 days 2 Years
MIFM-U13 ETU 3.7V, 60mAH Ni-Cd 1 21 days 2 Years
MIFA-U13 ETU 3.7V, 60mAH Ni-Cd 1 21 days 2 Years
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