
Protection
Alarms
SKF Multilog On
-Line System IMx-M
2 - 23
User Manual
Figure 2 - 16.
Demonstration of Alarm
Switching On and O
ff.
Table 2-3: Alarm switch on/off value.
Alarm
Alarm Switch On Value
Alarm Switch Off Value
Alert High
Alert high level value
Alert high level value - Alert hysteresis value
Alert Low
Alert low level value
Alert low level value + Alert hysteresis value
Danger High
Danger high level value
Danger high level value - Danger hysteresis value
Danger Low
Danger low level value
Danger low level value + Danger hysteresis value
Alarm Delayed Trigger and Release
The alarm enter and leave times are used as filters to prevent triggering alarms in a
situation where the alarm level could be exceeded for brief periods of time, because of
noise or other process specific reasons, even though there were no real alarm condition.
•
Enter time:
The period of time for a channel to have exceeded an alarm level
before an actual alarm condition is raised. Alert/Danger "ON" trigger will be
delayed by this Enter Time.
•
Leave time (only for digital channels):
The period of time which a channel in an
alarm state has to be out of its alarm operating range (alarm level adjusted with
configured
hysteresis
) before the alarm condition is canceled. Alert/Danger "OFF"
trigger will be delayed by this Leave Time.