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

Central Controllers and Expansion Units Power Supply Units
4.4.5

Maintenance

Replacing the
Lithium Battery
Caution
!
Incorrect replacement of the battery can result in the danger of explosion.
It should only be replaced by the same type or an equivalent type
recommended by the manufacturer. Used batteries should be disposed of
according to the manufacturer's instructions.
You can replace the backup battery without loss of data if the power supply
unit is switched on, or if you apply an external voltage (3.4 V) at the "Ext.
Batt." sockets. The backup battery must be replaced every 3 years at the
latest, irrespective of memory configuration and backup operation. Replace
the battery as follows:
Battery
Submodule
Only use battery submodules with the order number 6XG3 400-2CK00.
4-66
Step
1 Pull the cover downwards.
2 Pull the battery submodule forwards and out, and remove it.
3 Replace the battery.
4 Ensure correct polarity.
5 Once the new battery is fitted and system voltage is On, press the Reset
button on the power supply unit.
+
*
Action
Sockets for External
Backup Voltage
Battery Submodule
Cover
C79000-G8576-C199-06
System Manual