Differential Band Alarm - promesstec UREG 200 User Manual

6.10 Differential band alarm

The differential band alarm generates two switching
points, relative to the setpoint value. Two types of
differential band alarms can be set for alarms 1 and
2, DB.HI (Differential band deviation alarm) and
DB.LO (Differential band alarm), A1SP and A1HY
resp. A2SP and A2HY are hidden.
DB.HI switches the alarm if the difference (positive
and negative) between process and setpoint is
greater than set in A1DV or A2DV.
DBLO switches the alarm as long as the difference
between the process value and the setpoint is smal-
ler than set in A1DV or A2DV.
Alarm 1 switching point = SP1 ± A1DV
Alarm 2 switching point = SP1 ± A2DV
The 4 alarm settings can also be used for the differential band alarm (NORM, LTCH,
HOLD, LT.HO) can be set (for description see chapter 6.8).
Example:
Differential band alarm NORM
Differential band alarm LTCH
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2 Differential band alarm
adjustable:
DB.HI, DB.LO
Differential band alarm 1:
setting: A1FN, A1MD
Parameter: SP1, A1DV
Switching point=SP1 ± A1DV
Differential band alarm 2:
Setting: OUT2, A2FN, A2MD
Parameter: SP1, A2DV
Switching point=SP1 ± A2DV
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