Siemens PC 670 manual Replacing the Backup Battery, Battery voltage too low, Replacing the battery

Maintaining and Extending the Computing Unit Release 04/02

4.3Replacing the Backup Battery

Battery power supply for real-time clock and configuration

A backup battery (3.6 V lithium battery) powers the real-time clock even after the unit has been turned off. In addition to the time of day, all the information about the device (device configuration) is stored. If the backup battery fails or is removed from its plug, these data are lost.

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

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 the battery

In this case, you must replace the backup battery. The battery is located on the motherboard.

To change the battery, perform the following steps:

1.Disconnect the unit from the mains power supply and then disconnect all the connection cables.

2.Open the device as described in section 4.1.

3.Change the backup battery inserted in the motherboard by pulling out the cable 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 device.

7.Connect the unit to the power supply again and press the Reset button (refer to Chapter 4.11).

4-10 Panel PC 670 Computing Unit, Equipment Manual