19-2
OP27,
OP37 Equipment Manual
Release 05/99
19.2 Replacing
the Backup Battery
The
backup battery ensures that, in the event of a power failure
the operating data in the SRAM of the OP are retained and
the hardware clock does not stop.
A lithium battery is used in the OP
. It is already fitted when the device is sup
-
plied. It has a typical service life under normal operating conditions of approxi
-
mately four years. An exhausted battery is indicated in routine operation by a
system message on the OP
. Replace the backup battery as quickly as possible
after the message is issued.
The battery can be ordered via the Siemens spare parts service. It is shipped
ready for installation with a lead and connector
. Refer to our catalog ST80.1
for the order number
.
Observe the following before changing the battery:
!
Caution
Change the battery with the power supply switched on, in order to prevent
losses of data – for example, passwords.
The battery must be changed by a suitably qualified person.
Before replacing the battery
, note the ESD guidelines in Appendix F of this
manual.
Function
Service life
Source of supply
Before changing
the battery
Maintenance/Upkeep
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