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4.3.7.4 Alarms 1 & 2
Alarm 1 (or 2) Relay: To enable or disable (no alarm functions) the alarms .
Alarm 1 (or 2) Low: editable box for the low alarm value.
Alarm 1 (or 2) High: editable box for the high alarm value.
Active: If Above, Alarm condition triggered when the process variable is greater
than the Alarm Hi Value (Low value ignored). If Below, Alarm condition triggered
when the process variable is less than the Alarm Low Value (Hi value ignored). If
Hi/Low, Alarm condition triggered when the process variable is less than the
Alarm Low Value or above the Hi Value. If Band, Alarm condition triggered when
the process variable is above or below the "band" set around the Setpoint. Band
equals Hi Value (Low Value ignored).
A "band" is set around the Setpoint only in the "Deviation" Mode.
Normally: if Open, then the relay is "energized" only when an alarm condition
occurs. If Closed, this is "Fail Safe" Mode. Relay is energized under "normal"
conditions and becomes de-energized during alarm or power failure.
Latch: if Latched, Alarm remains "latched" until reset. To reset already latched
alarm, select Unlatched and press Update. If Unlatched, Alarm remains latched
only as long as the alarm condition is true.
Absolute: if Absolute, this allows Alarms to function independently from their
respective Setpoints. If the process being monitored does not change often, then
"Absolute" Mode is recommended. If Deviation, this allows changes to Setpoints
to be made automatically to their corresponding Alarms. Deviation Mode is
typically the ideal mode if the process temperature changes often. In Deviation
Mode, set Alarm 1 a certain number of degrees or counts away from Setpoints,
this relation remains fixed even if Setpoints are changed.
Alarm at Power On: If the alarm is enabled at Power On, the alarm will be
active right after reset. If the alarm is disabled at Power On, the alarm will
become enabled when the process value enters the non alarm area. The alarm
is not active while the process value is approaching the Setpoints.
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