Replacing The Backup Battery - Siemens SIMATIC Box PC 620 Manual

SIMATIC Box PC 620 Expansions
4.3

Replacing the Backup Battery

Battery Power Supply for Real-Time Clock and Configuration
A backup battery (3.6 V-lithium battery) powers the the real-time clock even after
the device is switched off. In addition to the time of day, all the information about
the Box PC (device configuration) is stored in RAM. If the backup battery fails or is
removed, all these data are lost.
When used under the permissible environmental conditions, a battery can last ap-
prox. 5-7 years. However, we recommend a precautionary replacement every
5 years.
Battery Voltage too Low
If the battery voltage is too low, the time is lost, and a correct configuration of the
device can no longer be guaranteed.
Replacing tthe Battery
In this case, you must replace the backup battery. The battery is on the
motherboard.
To change the battery, proceed as follows:
1. Disconnect the PC from the power supply and remove all the connecting cables.
2. Open the unit as described in Section 4.1.
3. Change the backup battery inserted in the motherboard by pulling out the
connector and undoing the cable tie.
4. Secure the new battery in its mounting with a cable tie.
5. Insert the battery connector in the motherboard.
6. Close the unit.
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