I’m trying to visualize some alerts configured in OpenHistorian on Grafan panels. For each PMU I have two alerts related to the Frequency :
- high frequency : Signal PMU_Frequency greater than 50.2 Hz during more than 0.5 sec.
- Low frequency : Signal PMU_Frequency lower than 49.8 Hz during more than 0.5 sec.
In grafana, the alerts are diplayed with a red vertical bar. the problem comes from the fact that it is always the same description of the alert that is displayed in both cases (high or low frequency) : the description of the high frequency alert.
(Note : for the test I put in fact 49.98 HZ for the low treshold frequency and 50.02 Hz for the high treshold one).
On the test we can see that it is the description of the high threshold alert that is displayed when it should be the low one.
In OpenHistorian, the correct alert is displayed in Monitoring > View Alarm Status
Maybe this issue is due to the fact that in the DB both alerts (in alarm table) have the same TagName / SignalID / AssociatedMeasurementID values ? Only the ID and Description values are differents.
Thanks by advance for any help you could provide