Reference: A938
Index: B
Page 38
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Instruction Manual – NPS914 Alarm and Indication IED
Figure. 4. - 3. Digital inputs assigned as alarm activating signals.
The user can assign digital inputs or logical outputs into alarms by clicking on the matrix. When the matrix
is done, it must be sent to the relay for the changes to take effect (
Commands
→
Write to relay
→
Logic
).
When the signal assigned into an alarm (digital input or logical output) activates, the alarm text is displayed
in the
Alarms
view in the relay's HMI. Active alarms are displayed in the
Alarms
display with a continuously
lit LED. A deactivated alarm text is displayed until the alarm has been cleared in the HMI. This kind of
alarm is displayed with a blinking LED in the
Alarms
display.
If the alarm signal's ON state has been checked in the
Event Mask
, an ALARM ON event is recorded with
a time stamp into the event history. These alarms are also reported in the communication protocol if one
is in use.
Clearing activated alarms
The user can clear all alarms by pressing the Ctrl button located in the IED front panel. Please note that
the signal will not be cleared if the alarm that has activated it is still active.
Alarms can be also cleared by using the CLEAR ALL ALARMS signal. In the image below a physical push
button activates Digital Input 4 which is connected to CLEAR ALL ALARMS.
After doing this in the logic editor, click Save and then update logic (
Commands
→
Write to relay
→
Logic
).
