Siemens SIMATIC Box PC 820, Manual

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2-7
Box PC 820 / PC FI45 V2, Manual
A5E00051531-03
2.5 Changing the Backup Battery
Battery Power Supply for Real-Time Clock and Configuration
A backup battery powers the real-time clock even after the PC is switched off. In
addition to the time of day, all information about the SIMATIC PC (configuration) is
stored. If the backup battery fails or is removed, these data are lost.
Because of the clock’s low power consumption and the lithium battery’s high
capacity, the battery can provide backup power for the real-time clock for several
years. Therefore, changing the battery is only seldom required.
Battery Voltage Too Low
If the battery voltage is too low, the current time setting is lost and a correct
configuration can no longer be guaranteed.
Changing the Battery
In this case, you must replace the battery. The battery is located underneath the
bus board.
To change the battery, proceed as follows:
1. Switch off your PC and unplug all connecting cables.
2. Open the housing as described in Section 1.
3. Remove the drive support and bus module.
4. Now replace the backup battery, which is attached to the motherboard by a
short length of a cable.
5. Reassemble drive support and bus module and close the unit.
!
Caution
You may only replace the lithium battery with an identical battery or a battery type
recommended by the manufacturer.
Dispose of used batteries in keeping with local regulations (special waste). If
returned to the manufacturer, the battery materials can be recycled.
Resetting SETUP
After having changed the backup battery, you have to reset the configuration data
of your PC using the SETUP program.
Motherboard
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