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Maintenance/Upkeep
18.2
Replacing the Backup Battery
Function
The backup battery ensures that, in the event of a power failure
Service life
Under normal operating conditions, the service life is approximately 4 years. A
dead battery is indicated in routine operation by a system message on the
Touch Panel. Replace the backup battery as quickly as possible after the mes-
sage is received.
Source of supply
The battery can be ordered via the Siemens spare parts service. It is shipped
ready for installation with a lead and connector. See our catalog ST80.1 for the
order number.
Before changing
Observe the following before changing the battery:
the battery
Caution
!
18-2
the operating data (trend data, passwords, messages) in the SRAM of the
Touch Panel is retained, and
the hardware clock does not stop.
Change the battery with the power supply switched on, in order to prevent
loss of data; passwords, for example.
The battery must be changed by a properly qualified person.
Before replacing the battery, note the ESD guidelines in Appendix E of
this manual.
TP27, TP37 Equipment Manual
Release 01/00
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