Siemens S5-135U/155U - Manual (Page 107)

4-41
System Manual
C79000-G8576-C199-06
The lithium battery can be replaced without memory loss if the PSU is
switched on, the rechargeable battery is in order or you apply an external
(4.5 V) voltage to the “Ext.Batt.” terminals.
Replace the lithium battery in the following steps:
Step Action
1 Slide the battery compartment cover down.
2 Pull the battery compartment out.
3 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.
4 Insert the new lithium battery in the battery compartment
Important:
Ensure correct polarity.
5 Slide the battery compartment in.
6 Close the cover.
7 Press the Reset button.
Result (only with PSU on):
– “MB low” LED goes off.
– Contacts 14 and 15 of the
Battery Warning relay are bridged.
The three fans are situated at the bottom of the power supply unit and can be
individually replaced during operation.
If you operate your power supply with a filter, you must first release the filter
subdrawer and pull it out before you can replace a fan (see Section entitled
“Replacing the Filter Mat”).
Replacing the
Lithium Battery
How to Replace
the Lithium Battery
Replacing a Fan
Location of the
Fans
Before
Replacement
Central Controllers and Expansion Units Power Supply Units