Siemens S5-135U/155U Lithium Battery, How to Replace, Replacing a Fan Location, Before

Central Controllers and Expansion Units Power Supply Units

Replacing the	The lithium battery can be replaced without memory loss if the PSU is
Lithium Battery	switched on, the rechargeable battery is in order or you apply an external
	(4.5 V) voltage to the ªExt.Batt.º terminals.
How to Replace	Replace the lithium battery in the following steps:
the Lithium Battery

Step

Action

1

2

3

4

5

6

7

Slide the battery compartment cover down.

Pull the battery compartment out.

Remove the old lithium battery from the battery compartment by inserting a screwdriver through a hole in the compartment base to push the battery upwards.

Insert the new lithium battery in the battery compartment

Important:

Ensure correct polarity.

Slide the battery compartment in.

Close the cover.

Press the Reset button.

Result (only with PSU on):

±ªMB lowº LED goes off.

±Contacts 14 and 15 of the

Battery Warning relay are bridged.

Replacing a Fan
Location of the	The three fans are situated at the bottom of the power supply unit and can be
Fans	individually replaced during operation.
Before	If you operate your power supply with a filter, you must first release the filter
Replacement	subdrawer and pull it out before you can replace a fan (see Section entitled
	ªReplacing the Filter Matº).

System Manual	4-41
C79000-G8576-C199-06