7.14.3. Alarm type and classification
Alarm types
In addition to logbook events, the meter manages two types of alarm:
Fatal
These alarms cause the meter to enter the non-operational mode (STOP displayed on the LCD) where only
instantaneous values are processed and no further registration of energy or demand/load profile calculation
is performed.
The meter should be removed from the installation site and tested. It will still contain all the metered data
collected up to the point the fatal alarm occurred.
Non-fatal
The meter is still able to operate during this type of alarm and some of these alarms are purely informative.
Alarm classification
Alarms are further classified according to the way they clear, as follows:
Self-healing
These alarms automatically clear when the alarm state disappears.
Trapped
These alarms will only clear when a reset command is performed (via communication or pushbutton) even if
the alarm state has disappeared.
Fatal alarm types can only be cleared by a reset command, therefore, they are always trapped.
Fugitive
For some alarms (e.g. a communication error) there is only an alarm appearance event. These can only be
cleared by a reset command as there is no alarm disappearance event.
Therefore, fugitive alarm types are always trapped.
7.14.4. Alarm notification
Alarms are reported only when the corresponding event is logged into the logbook. Therefore, it is important that
the following events are selected for inclusion in the logbook:
Non fatal alarm appearance
Non fatal alarm disappearance
Fatal alarm appearance
When an alarm is detected by the meter it can be reported in several ways:
an alarm display on the meter LCD
a triggered control output
an SMS or email message
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