Maintenance And Repairs - Siemens S5-135U/155U System Manual

Central Controllers and Expansion Units Power Supply Units
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
New battery,
backup time in weeks
Battery 3 years old,
backup time in weeks
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 The rechargeable battery should be replaced at regular intervals (service life
Battery of 6 years at 40
supply and failed battery, the backup times of the rechargeable battery are as
follows:
I
backup
Backup time in weeks
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.
4-40
mA 0.25 1
81.5 27.4
64.2 21.6
o o
C (104 F) ambient temperature). With a failed power
mA 0.25 1
18.8 6.3
2 3 4 5
14.5 9.9 7.5 6.0
11.5 7.8 5.9 4.8
2 3 4 5
3.4 2.3 1.7 1.4
System Manual
C79000-G8576-C199-06