Siemens S5-135U/155U appendix Maintenance and Repairs, Fans, Follows, Filter Mat

Central Controllers and Expansion Units Power Supply Units

4.3.4Maintenance 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:

Ibackup mA

New battery,

backup time in weeks

Battery 3 years old, backup time in weeks

0.25

81.5

64.2

1

27.4

21.6

2

14.5

11.5

3

9.9

7.8

4

7.5

5.9

5

6.0

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	The rechargeable battery should be replaced at regular intervals (service life
Battery	of 6 years at 40 oC (104 oF) ambient temperature). With a failed power
	supply and failed battery, the backup times of the rechargeable battery are as
	follows:

Ibackup mA

Backup time in weeks

0.25

18.8

1

6.3

2

3.4

3

2.3

4

1.7

5

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.

4-40	System Manual
	C79000-G8576-C199-06