tAlarm and tWarning are independent settings, that is, there is no
check if tAlarm > tWarning.
The limit for the overflow supervision is fixed at 99999.9 hours.
The setting tAddToTime is a user settable time parameter in hours.
1MRK 506 369-UEN B Section 18
Monitoring
Line distance protection REL670 2.2 IEC 797
Application manual
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