4.3.4
Maintenance and Repairs
Lithium battery
The lithium battery should be replaced when a battery failure is
indicated. The backup times of the lithium battery are given in the
following table:
I
backup
mA
0.25
1
2
3
4
5
New battery,
backup time in weeks
81.5
27.4
14.5
9.9
7.5
6.0
Battery 3 years old,
backup time in weeks
64.2
21.6
11.5
7.8
5.9
4.8
Fans
If a fan fails, replace it as quickly as possible. The behavior of the
power supply in the event of fan failure is described in Section 4.3.5.
Rechargeable battery
The rechargeable battery should be replaced at regular intervals
(service life of 6 years at 40
o
C (104
o
F) ambient temperature). With a
failed power supply and failed battery, the backup times of the
rechargeable battery are as follows:
I
backup
mA
0.25
1
2
3
4
5
Backup time in weeks
18.8
6.3
3.4
2.3
1.7
1.4
Filter mat
The replacement intervals for the filter mat (with the air filter option)
depend on the ambient conditions under which the power supply unit
is in operation.
4
Power Supply Units
System Manual
C79000-B8576-C199-03
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