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4.3.3 Defining events to monitor
To detect and record the occurrence of special situation, such as overload or phase failure, limit values can be
defined. The state of a limit or a combination of multiple limit states can then in the logic module be classified
as event or alarm. So each changing can be recorded in the appropriate event lists with the time-stamp of its
occurrence. Up to 64 limit values and up to 32 logic functions (events to monitor) may be defined.
Example: Monitoring an overload situation
In the register „limit values“ for each active phase power a limit value is defined. For each limit you have define
the values limit for ON state and limit for OFF state.
Limit for OFF state
Limit state
0
1
Limit for ON state
Depending on the application limit values are used to monitor if a value is exceeded (upper limit) or falls below
a certain limit (lower limit). The limit for ON state always corresponds to the measurement where the limit state
changes to „1“, the limit for OFF state is the measurement for which the state changes back to “0”. The
difference of the two values corresponds to the hysteresis.
In the „ logic module “ the states of the three monitored phase powers will be defined as input for the logic
function LS <1> and combined using a logical „OR“. If one of the three limit values is exceeded, the logic output
becomes „1“. This way a list entry “overload” into the event list is initiated. As soon as the logic output goes
back to „0“ the text “load o.k.“ will be written into the event list.