4 maintenance and repairs – Siemens S5-135U/155U User Manual
Page 106
4-40
System Manual
C79000-G8576-C199-06
4.3.4
Maintenance and Repairs
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
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.
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
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.
Lithium Battery
Fans
Rechargeable
Battery
Filter Mat
Central Controllers and Expansion Units Power Supply Units