Siemens S7-400 installation manual Replacing the Backup Battery

Maintenance

7.1Replacing the Backup Battery

Replacing the Backup Battery

1.Discharge any static charge by touching a grounded metal part of the S7-400.

2.Open the cover of the power supply module.

3.Using the loop(s), pull the backup battery/batteries out of the battery compartment.

4.Insert the new backup battery/batteries in the battery compartment of the power supply module.

Ensure correct polarity of the battery/batteries.

5.Switch on battery monitoring with the BATT INDIC slide switch.

If You ...	...Then
have a single-width power supply module,	set the BATT INDIC switch to
	BATT.
have a double or triple-width power supply module	set the BATT INDIC switch to
and want to monitor a backup battery,	1BATT.
have a double or triple-width power supply module	set the BATT INDIC switch to
and want to monitor both backup batteries,	2BATT.

6.Press the FMR button.

7.Close the cover of the power supply module.

Note

If you store the batteries for a long period, a passivation layer may form. Please read Section 6.8, Inserting a Backup Battery.

7-2	Automation System S7-400	Hardware and Installation
		A5E00850741-01