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3–9 Deviation Alarm
OUT2 can be configured as alarm 2 by selecting AL2. If AL2 is selected for
OUT2, then output 2 will perform alarm 2 function. Now NONE can’t be select-
ed for A2FN, otherwise Er06 will appear. A deviation alarm alerts the user when
the process deviates too far from the set point. The user can enter a positive or
negative deviation value (A1DV, A2DV) for alarm 1 and alarm 2. A hysteresis
value (A1HY or A2HY) can be selected to avoid interference problems in a noisy
environment. Normally, A1HY and A2HY can be set with a minimum (0.1)
value. The trigger level of the alarm moves with the set point.
For alarm 1,
trigger level=SP1+A1DV±A1HY.
For alarm 2,
trigger level=SP1+A2DV±A2HY.
A1SP and/or A2SP are hidden if alarm 1 and/or alarm 2 are set for deviation
alarm. One of four alarm modes can be selected for alarm 1 and alarm 2. These
are: normal alarm, latching alarm, holding alarm and latching/holding alarm. See
section 3-8 for descriptions of these alarm modes.
Examples:
2 Types of Deviation Alarms:
DE.HI, DE.LO
Deviation alarm 1:
Setup: A1FN, A1MD
Adjust: SP1, A1DV, A1HY
Trigger levels: SP1+A1DV±A1HY
Deviation alarm 2:
Setup: OUT2, A2FN, A2MD
Adjust: SP1, A2DV, A2HY
Trigger levels: SP1+A2DV±A2HY
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