Watlow Series F4S/D - Manual (Page 72)

6 . 8 ■ F e a t u r e s Wa t l o w S e r i e s F 4 S / D
Alarms
Alarms are activated when the process value or
temperature leaves a defined range. A user can
configure how and when an alarm is triggered,
what action it takes and whether it turns off auto-
matically when the alarm condition is over.
Configure alarm outputs in the Setup Page before
setting alarm set points.
Alarm Set Points
The alarm high set point defines the process value
or temperature that will trigger a high side alarm.
It must be higher than the alarm low set point and
lower than the high limit of the sensor range.
The alarm low set point defines the temperature
that will trigger a low side alarm. It must be lower
than the alarm high set point and higher than the
low limit of the sensor range.
Location in software: Operations Page > Alarm Set
Point > Alarm x (1 or 2).
Alarm Hysteresis
An alarm state is triggered when the process value
reaches the alarm high or alarm low set point.
Alarm hysteresis defines how far the process must
return into the normal operating range before the
alarm can be cleared.
Alarm hysteresis is a zone inside each alarm set
point. This zone is defined by adding the hysteresis
value to the alarm low set point or subtracting the
hysteresis value from the alarm high set point.
Location in software: Setup Page > Alarm Output x
(1 or 2).
Figure 6.8 — Alarm Settings.
Normal Operating Range
Low Side Alarm Range
High Side Alarm Range
Alarm High Set Point
Alarm Low Set Point
Time
Temperature
Alarm Hysteresis
Alarm Hysteresis
Process or Deviation Alarms
A process alarm uses one or two absolute set points
to define an alarm condition. A deviation alarm us-
es one or two set points that are defined relative to
the control set point. High and low alarm set points
are calculated by adding and/or subtracting offset
values from the control set point. If the set point
changes, the window defined by the alarm set
points automatically changes with it.
In the Series F4 you must configure each alarm
output as either a process or deviation alarm.
Location in software: Setup Page > Alarm Output x
(1 or 2).