Crontab reports a power supply error every 12 hours

My 7026-b80 uses a dual-power supply, because only one side of the power supply has been inserted, the result is always reported warning.

Use # crontab-l root to check crontab. The system automatically adds the following statement:

0 **** wall % RC. powerfail: 2: Warning !!! The system is now operating with
Power problem. This message will be walled every 12 hours. Remove this crontab
Entry after the problem is resolved.
Use # crontab-e root to modify the file, delete this sentence, and then connect the power of the other side. The system is OK.