Reference: A938
Index: B
Page 24
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Instruction Manual – NPS914 Alarm and Indication IED
DIGITAL INPUTS
Figure. 3.4. - 22. Digital input settings.
All settings related to digital inputs can be found in the "Digital inputs" section.
The "Digital inputs settings" subsection includes various settings for the inputs: the polarity selection
determines whether the input is Normally Open (NO) or Normally Closed (NC) as well as the activation
threshold voltage
(16…200 V
AC/DC
, step 0.1 V) and release threshold voltage
(10…200 V
AC/DC
, step 0.1 V)
for each available input. There is also a setting to determine the wanted activation and release delay
(0…1800 s, step 1 ms). Digital input activation and release threshold follow the measured peak value. The
activation time of an input is
5…10 ms. The release time with DC is 5…10 ms, while with the AC it is less than
25 ms. First three digital inputs don't have activation and release threshold voltage settings as these are
defined when ordering the unit.
Digital input statuses can be checked from the corresponding subsection ("Digital input status"). The "Digital
input descriptions" subsection displays the texts the user has written for each digital input. In the "Event
masks" subsection you can determine which events are masked
–and therefore recorded into the event
history
– and which are not.
Figure. 3.4. - 23. Digital outputs subsection.
All settings related to digital outputs can be found in the "Digital outputs" section.
