Installing And Removing The Backup Battery - Siemens SIMATIC Panel PC 870 Equipment Manual
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4.6
Installing and removing the backup battery
Battery supply for clock and configuration
A backup battery (3.6 V lithium battery on the motherboard; see Fig. 4-2) ensures
that the hardware clock will also operate when the device is switched off. In
addition to the time of day, the device configuration is also stored. In case of a
failure of the backup battery or disconnection from the plug contact, these data are
lost.
Thanks to the low current comsumption of the clock and the high capacity of the
lithium battery, the battery is able to backup the clock over several years. It is
therefore only seldom required to replace the battery.
Battery voltage too low
If the battery voltage is too low, the current time of day is lost, and no correct
device configuration is guaranteed any more; in this case, the battery must be
replaced.
Changing the battery
Proceed as follows:
1. Disconnect the device from the mains and remove all interconnecting cables.
2. Open the device as described in Section 3.1.
3. Change the backup battery by removing the connector from base X49 of the
motherboard (see Fig. 4-3) and remove the battery from its holder.
4. Attach the new battery in its holder and connect the battery connector to the
motherboard.
5. Close the device.
Warning
!
Risk of personal injuries and material damage; risk of emission of hazardous sub-
stances!
If handled not correctly, a lithium battery can explode; in case of disposal of old
batteries not acc. to the relevant standards, hazardous substances can be
emitted.
The lithium battery must only be replaced by identical types or types recom-
mended by the manufacturer (Order No.: W79084-E1003-B1).
Do not throw new or discharged lithium batteires into the fire; do not solder at the
cell body; never try to discharge lithium batteries and do not open them with vio-
lence.
As far as possible, exhausted lithium batteries should be returned to the battery
manufacturer/recycler or be disposed of as special waste.
Changing the SETUP settings
After a battery change or after the battery connector has been removed, the
configuration data of your device must also be changed using the program
BIOS–SETUP (see Chapter 5).
Panel PC 870 Computing Unit Equipment Manual
Edition 12/01
Servicing and Expanding the Computing Unit
4-15
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