Reference: A938
Index: B
Page 37
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Instruction Manual – NPS914 Alarm and Indication IED
4. Alarming
function
Signal alarming is the main feature of NPS914 Alarming IEDs. The alarming unit has 64 alarms the user
can set. The user defines each alarm description and activating signal. These settings are controlled in
the
Alarm settings
menu (
Control
→
Device I/O
→
Alarm settings
).
The alarming unit generates events with time stamps into the event history and the alarm statuses can be
reported to the remote terminal unit (RTU).
The alarm display has two different modes: dynamic and fixed screen. The fixed screen always lists 1 to
16 alarm texts on the display. The dynamic screen starts with an empty display and fills up the list as
alarms are activated. Switching between these modes can be done in the
General
menu.
Alarm descriptions
Figure. 4. - 1. User-edited alarm descriptions.
The user-edited alarm text is displayed in the
Alarm
view in the HMI when the alarm has been activated.
The user can update the descriptions in the settings (
Commands
→
Write settings
).
Assigning digital inputs into alarms
The setting of alarms is divided into four tabs in groups of 16. The user can assign a digital input or a logic
output into each of the alarms. When any of the alarms has been activated by the assigned signal, the
alarm appears in the
Alarms
menu in the relay's HMI.
Figure. 4. - 2. Assigning alarms.
