PM861 redundancy problem
Dear every one,
We are using 02 PM861 in redundancy mode, but some time PM861 Primary failure and PM861 Backup failure also, we don't know why Primary doesn't transfer to Backup CPU.
Please help us.
(The accident havepened in 2013-12-12)
Please see att log file from Primary and Backup CPU.
Sorry to upload more about this because i couldn't att file.
Redundant CPU's will protect you against a hardware failure of one CPU. But they often cannot protect you from a software crash. Basically, the fault that causes the primary CPU to fail can also sometimes cause the backup to fail. Thats probably what happened in this case - your log file shows the controller crashed rather than a hardware failure.
You need to ensure that you are running up to date firmware versions. ( But of course my personal preference is not to immediately update to the latest software release unless you are trying to resolve a known issue. ) Check the release notes for your current version and later version to see if there are known issues that could affect your site. Open a supportline case and submit the controller log files to ABB