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Operating the Controller - CPU 41x-2 PCI
4.10
Removing the Passivation Layer on the Backup Battery
When lithium batteries (lithium/thionyl chloride) are used as backup batteries, the
battery may not function immediately if the battery has been stored a long time and
has developed a passivation layer. Under certain circumstances, this can cause an
error message to be displayed after the CPU 41x-2 PCI is switched on.
The CPU 41x-2 PCI is in the position of removing the passivation layer on the
lithium battery through defined loading of the battery. This operation can take
several minutes. When the passivation layer is removed and the lithium battery has
reached its rated voltage, the error message can be acknowledged in the controller
panel by selecting CPU > FMR.
Since the storage time of the lithium battery is generally not known, we recommend
the following procedure:
1. Connect the backup battery to the BATT. socket on the slot bracket of the
CPU 41x-2 PCI.
2. Acknowledge any battery error message in the controller panel (BATF LED
display) by selecting CPU > FMR.
3. If the battery error cannot be acknowledged, repeat the acknowledgment
attempt after a few minutes.
4. If the battery error still cannot be acknowledged, remove the battery and short-
circuit it for 1 to 3 s.
5. Apply the battery again and re-attempt the acknowledgment by selecting
CPU > FMR.
-
If the display for the battery error message goes out, the battery is
functional.
If the display for the battery error message does not go out, the battery is
-
empty.
Note
If the power supply for the CPU 41x-2 PCI fails while you are changing the
backup battery, the user program and data that you wanted to store
retentively will be lost.
Remedy: connect the CPU 41x-2 PCI to an additional external 24 VDC.
74
Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
Windows Automation Center, WinAC Slot Version 4.0
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