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N31U User manual
Designations used in the drawing:
• AL_L – corresponds to PrL setting and determines the alarm state change
lower threshold.
• AL_H – corresponds to PrH setting and determines the alarm state
change upper threshold.
Note: It is important to keep in mind when conguring the alarms that
the entered threshold values should match the dependency AL_L <
AL_P. Otherwise the dependency will disable the alarms.
An additional alarm function makes it possible to dene an alarm activation
and deactivation delay. The user can dene how long the alarm event must
last before the alarm relay contacts are switched on and the minimum time of
the alarm event end before the relay contacts are switched o. Alarm delays
prevent false alarms caused by a short-term change of the measuring value,
e.g. opening the door to the cold store.
The alarm event could be registered if the alarm memory is enabled.
Fig. 12: Alarm types: a) n-on; b) n-o; c) o; f) on.
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