Siemens 620 appendix Replacing the Backup Battery, Battery Voltage too Low, Replacing tthe Battery

SIMATIC Box PC 620 Expansions

4.3Replacing 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.

The clock uses very little power and the lithium battery has a high capacity so that the battery can provide backup power for the real-time clock for many years and seldom needs to be replaced.

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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